doc - small fixes

vec - add CeedVectorScale

Merge branch 'jeremy/vec-ops' [PR #744]

* jeremy/vec-ops:
vec - add tests for ceed compatibility for AXPY and PointwiseMult
vec - add PointwiseMult and AXPY convenience functions

vec - add PointwiseMult and AXPY convenience functions

Merge pull request #743 from CEED/jeremy/tidy

tidy - small fixes

Merge pull request #739 from CEED/jeremy/copy-ptr

Copy Ceed Object References

tidy - small fixes

interface - add reference copying functions
Co-authored-by: Jed Brown <jed@jedbrown.org>

interface - add Ceed*Reference functions

Merge pull request #733 from CEED/jeremy/more-registration

Extra error message for uncompiled backends

Update ceed.c (#737)

Fix function name in docs

minor - improve error message for uncompiled backends

ceed - create CEED_MAX_BACKEND_PRIORITY, use to repair registry list reporting

typo - fix spelling

Merge pull request #735 from CEED/jeremy/style-guide

Style Unification

style - updating C variable style

Merge pull request #730 from CEED/jeremy/match-error

interface - improved resource matching check

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

Merge pull request #716 from CEED/jed/install-backend.h

Jed/install backend.h

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

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