minor - improve error message for uncompiled backends

ceed - create CEED_MAX_BACKEND_PRIORITY, use to repair registry list reporting

build - register exact names of backends in CeedRegister_Weak for better error messages

typo - fix spelling

style - updating C variable style

interface - update CeedRegistryGetList to use malloc directly, make priorities array optional

interface - add help option for CeedInit and function to access arrays of resources + priorities

interface - improved resource matching check

Install install backend headers under include/ceed/

This makes it possible to distribute source plugins that provide
additional backends. It's also used in MFEM, perhaps temporarily.

Deprecate ceed

Install install backend headers under include/ceed/

This makes it possible to distribute source plugins that provide
additional backends. It's also used in MFEM, perhaps temporarily.

Deprecate ceed-backend.h, which was not previously installed, but some
users accessed it from an in-place build.

Also install CUDA and HIP headers that allow users to provide CUfunction
and hipFunction_t.

Co-authored-by: Jeremy L. Thompson <jeremy.thompson@colorado.edu>
Requested-by: Andrew T. Barker <barker29@llnl.gov>

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Stricter field checking and better error messages

Add CEED_ERROR_INCOMPATIBLE because CEED_ERROR_MINOR is not very descriptive.

operator - minor error for CEED_EVAL_WEIGHT + non-trivial restriction

Stricter field checking and better error messages

Add CEED_ERROR_INCOMPATIBLE because CEED_ERROR_MINOR is not very descriptive.

operator - minor error for CEED_EVAL_WEIGHT + non-trivial restriction

Co-authored-by: Jeremy L. Thompson <jeremy.thompson@colorado.edu>

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Full assembly of CeedOperator (#712)

* Add CeedOperatorLinearFullAssemble() to explicitly assemble a CeedOperator

The output format is a stream of (row, column, value) triples, which client
code

Full assembly of CeedOperator (#712)

* Add CeedOperatorLinearFullAssemble() to explicitly assemble a CeedOperator

The output format is a stream of (row, column, value) triples, which client
code can use to assemble a sparse matrix by adding the values in the
appropriate places.

* Add full assembly test for triangular mesh, t563-operator.c, which is analogous to t536-operator.c

* assembly: change interface to separate nonzero structure from values

* assembly: add potential backends for CeedOperatorLinearAssemble, CeedOperatorLinearAssemblySymbolic

* assembly: use CeedMatrixMultiply() instead of hand-rolled duplicated code

This also involves switching some arrays from column-major ordering to
row-major ordering.

* Remove CeedMatrixMultiply from ceed-impl.h because it is already in ceed-backend.h

* assembly: modify use of fallback resource

* operator - use new error codes in full assembly

* style - minor

* operator - switch default fallback to none

* operator - fix fallback for full assembly

* operator - fix fallback usage

* operator - fix fallback for digonal assembly

* avx - revert bug

* avx - revert bug

Co-authored-by: jeremylt <thompson.jeremy.luke@gmail.com>

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Error Handling Improvement [fix #696] (#691)

* Operator - add operator/qfunction field compatibility checks

* QFunction - do not allow adding fields to QFunction in use with an operator

* Exam

Error Handling Improvement [fix #696] (#691)

* Operator - add operator/qfunction field compatibility checks

* QFunction - do not allow adding fields to QFunction in use with an operator

* Examples - add some extra exclusion markers in ceed example

* error - add error enum

* error - update error enum names and numbering

* error - use CEED_ERROR_BACKEND in all backend errors

* error - begin classifying interface errors

* error - update backends to use CEED_ERROR_SUCCESS and CeedChkBackend

* error - use new errors in gallery

* error - add some unsaved modifications

* error - improve documentation

* error - define CEED_ERROR_SUCCESS in GPU JiT; we really should have a common header to pipe defines to the JiT code

* error - more error code editing

* error - fix error string

* operator - fix setting field qpts

* basis - add input/output dimension error checking

* python - move basis utility methods to ceed object, no basis required or used

* python - force exit with negative error code

* make style-py

* rust - initial work to add error handling logic

* rust - add ceed.resource method

* rust - add results for methods that may fail

* rust - also format doctests

* minor - drop unused CeedChk()

* error - rename terminal/nonterminal to major/minor

* rust - set ErrorStore as default errorhandler

* python - revert error handing change for python

* python - use success error code from C bindings

* error - only upgrade error code in backend if positive

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Merge branch 'jed/ceed-version' [PR #698]

* jed/ceed-version:
Add version macros and CeedGetVersion() [fix #697]

Add version macros and CeedGetVersion() [fix #697]

Requested-by: Freddie Witherden <freddie@witherden.org>

Modify CeedErrorFormat, CeedGetErrorMessage, CeedResetErrorMessage
to find errmsg in parents.

Currently, CeedErrorStore puts its message in the top-level Ceed
object by following parents up the tree

Modify CeedErrorFormat, CeedGetErrorMessage, CeedResetErrorMessage
to find errmsg in parents.

Currently, CeedErrorStore puts its message in the top-level Ceed
object by following parents up the tree. This commit modifies the
other functions that access the error message to duplicate that
same behavior, so that in particular CeedGetErrorMessage(ceed, ...)
will return the same message that CeedErrorStore(ceed, ...) sets.

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headers - clearify includes to not rely on transitive includes (#701)

* headers - clearify includes to not rely on transitive includes

* style - add header recommendations from 'include-what-you-

headers - clearify includes to not rely on transitive includes (#701)

* headers - clearify includes to not rely on transitive includes

* style - add header recommendations from 'include-what-you-use'

* style - apply 'include-what-you-use' changes to CUDA backends

* style - 'include-what-you-use' for hip backends

* style - drop ceed.h includes in gallery qf source

* docs - add dev notes for header files

* style - header style and alphabetize

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Rust - add examples (#683)

* Rust - initial version of ex1

Example - move closure

Co-authored-by: Jed Brown <jed@jedbrown.org>

typo fix

Co-authored-by: Jed Brown <jed@jedbrown.org>

mi

Rust - add examples (#683)

* Rust - initial version of ex1

Example - move closure

Co-authored-by: Jed Brown <jed@jedbrown.org>

typo fix

Co-authored-by: Jed Brown <jed@jedbrown.org>

minor tidying

order -> degree

drop operator applicaiton messages

* rust: make top-level workspace and use libceed from path

This allows a single "cargo test" from the top level.

* rust: add version-sync (to help us remember when we publish a crate)

* examples - consistency update

* Rust - add Cargo.lock to top level gitignore

* rust - refactor example to add tests

* Rust - test and style from workspace

* Rust - update year in header

* Rust - add error values to Error, switch to String

* Rust - add input validation in check

* Rust - format volume output in example

* Rust - update example help output

* Rust - example tests rename to simplify

* Rust - split example 1 into 3 parts

* rust: std::sync::Once for CeedRegisterAll()

* Promote CeedRegisterAll() and CeedQFunctionRegisterAll() to User
* Guard calls to CeedInit() to avoid races in parallel testing

* Examples - update rust example to new builder syntax

* Examples - add rust ex2

* Rust - add CEED_STRIDES_BACKEND

* Examples - drop unused restriction in ceed ex2

* Rust - minor documentation update

* Rust - adopt convention of 'dimension-like' values all using usize; reduces casting

* Actions - add Rust code coverage

* Rust - fix usize conversion

* Rust - update casting between i32(C interface) and usize(Rust interface)

* Actions - include Rust doctests

* Actions - Rust doctest coverange only avaliable in nightly

* Rust - drop explict typing of values passed to C get* functions

* Rust - modify version numbers tests, cargo-tarpaulin and cargo have different calling paths in tests

* cargo fmt

* Examples - add separate Rust example quiet mode

* Actions - rustfmt not always avaliable on nightly

* Rust - simplify version tests

* Actions - add a few notes

* CodeCov - try adding gallery to 'fixes'

* CodeCov - drop some codecov noise in examples

* Examples - test all combinations in ex1/ex2

* Rust - test 3d examples without quiet flag

* Actions - use gcc-10 for compatibility in gcov reports

* Examples - test gallery in 1/2/3d in Rust ex

* Gitlab - also report gcov version

* JUnit - adjust indentation

* Gitlab - make it easier to find complier info in logs

* Tests - fix minor styling strangeness in t002

* Actions - only upload rust coverage

* Actions - exclude non-rust files from rust coverage

* Cov - exclude weak symbols code, not useful cov info

* Examples - clean up options creation for tests in Rust examples

* Examples - simplify tolerance for testing Rust examples

* cargo fmt

* Examples - another match

* Examples - common Rust example code in shared local crate

Co-authored-by: Jed Brown <jed@jedbrown.org>

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Add static library (libceed.a) [resolve #670]

We no longer use __attribute__((constructor)) to register backends and
gallery implementations because we can't ensure that the symbols are
linked into

Add static library (libceed.a) [resolve #670]

We no longer use __attribute__((constructor)) to register backends and
gallery implementations because we can't ensure that the symbols are
linked into applications that link the static library. We've switched to
creating CeedRegisterAll() and CeedQFunctionRegisterAll(), which are
called automatically by the library, and call weak symbols to register
all the backend/gallery implementations. This strategy was partly
motivated by not wanting to have preprocessor macros describing what is
available, and the associated need to recompile rather than just relink
when those macros change.

So we now have backends/ceed-backend-list.h that declares all the
backends wrapped in a macro. It is included by
backends/ceed-backend-weak.c to create weak definitions of all the
backends. In the makefile, we sort so this comes last when linking a
shared or static library, and thus these weak symbols will only be
picked up if they were not defined by the actual backend source files.
The same header is included (with different macro wrapping) in
interface/ceed-register.c, where CeedRegisterAll() is defined.

To add a new backend, one must do essentially the same registration
strategy as in the past, plus add one line to the common
ceed-backend-list.h.

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Make fallback Ceed use Error callback of parent

Use pointer to va_list in error handler

va_list is implementation defined, so a pointer works better with FFI.

Bugfix in `CeedOperatorLinearAssembleAddDiagonal`

Bugfix in `CeedQFunctionCreateInteriorByName`

Bugfix in `CeedOperatorSingleView`

Ceed - require 2+ chars to match in resource; every resource starts with /

Jeremy/py debugging (#637)

* Ceed - only store error with parent

* Python - assert state is not in write status

* Vector - add reader check to destructor

* make style

* remove debugging

Jeremy/py debugging (#637)

* Ceed - only store error with parent

* Python - assert state is not in write status

* Vector - add reader check to destructor

* make style

* remove debugging assertion

* Python - minor documentation correctness

* Python - hold reference to data array for USE_POINTER to prevent gc

* Python - hold reference to data array for USE_POINTER to prevent gc for restriction and context

* Python - use None object for initial ref back to ceed objects

* Python - add USE_POINTER to imports as needed

* Junit - update valid error message for writable access lock

* Python - change exception raised test to help gc

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