cpu - fix unclear variable names in operator impl

cpu - remove e_data array from backend operator data

op - turn magic number 16 into constant CEED_FIELD_MAX

qf - cache more QF assembly components for CPU

op - add CeedOperatorLinearAssembleQFunctionBuildOrUpdate to reduce kernel calls in diagonal/full/fdm assembly

interface - refactor *GetFields to include number of fields

op - impl restriction only identity operators for CPU, error on code gen GPU backends

style - updating C variable style

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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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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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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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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QFunction Context Data Object (#596)

* Ctx - create context object for QFunction context data

* Context - rename UserContext -> QFunctionContext

* Ctx - add lcov markers

* Ctx - fix leak in

QFunction Context Data Object (#596)

* Ctx - create context object for QFunction context data

* Context - rename UserContext -> QFunctionContext

* Ctx - add lcov markers

* Ctx - fix leak in identity QFunctions

* Hip/Cuda - rename sync functions for vector/context

* Tests - lcov marker update

* QFunction - drop unused function

* Python - fix copy-paste errors

* Ctx - update notes for Fortran usage

* Fortran - drop unneeded cast

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

* Interface - use void* for SetData interfaces

* Make - use call quiet for NVCC

* Interface - use void* for GetData interfaces

* Make - add quiet call option for examples

* Makefile - create common makefile to reduce duplication/complexity in example makefiles

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

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Style - update backend operator function names to use Add as needed

spellcheck

Ceed - add IsDeterministic

style - rename AssembleLinear* to LinearAssemble*

style - change Get*Status to Is*

ElemRestriction - add check for strided status

ElemRestriction - add state counter for reading offsets array

ElemRestriction - add ElemRestrictionGetOffsets

Restriction - convert restiction to use offsets instead of interlace mode. CPU and Python impl only, CUDA and MAGMA left to do.

Remove unreachable break statements

LCOV - shift markers to avoid extranious misses