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

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

Style Unification

style - updating C variable style

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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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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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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Merge branch 'main' into natalie/hip-ref-v2

Merge pull request #586 from CEED/jeremy/cuda-assemble-add

CUDA - Fix Backend Setting LinearAssemble*

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

Merge branch 'main' into natalie/hip-ref-v2

Merge pull request #577 from CEED/jeremy/take-array

Vec - add CeedVectorTakeArray

Op - use CeedVectorTakeArray in backends to reset array access

Merge pull request #564 from CEED/jeremy/cuda-diag

CUDA - LinearAssemble*Diagonal

Ref - compute QF value bound once

CUDA - inital version of LinearAssemble*

Merge pull request #560 from CEED/jeremy/diag-vec

LinearAssemble Improvements

Op - add AssembleAdd version of diagonal assembly functions, will be helpful for MFEM integration

Op - change LinearAssemble* to accept CeedVector instead of pointer to CeedVector, allows for less memory movement and interfaces with parent code better

Merge pull request #558 from CEED/jeremy/func-rename

Rename Functions

style - rename AssembleLinear* to LinearAssemble*

style - change Get*Status to Is*

Composite Operator support for AssembleLinearDiag/PBDiag (#552)

* ref - add composite operator support for building diagonal/pb diagonal

* ref - add error for non-composite mult-field operator di

Composite Operator support for AssembleLinearDiag/PBDiag (#552)

* ref - add composite operator support for building diagonal/pb diagonal

* ref - add error for non-composite mult-field operator diagonal/pb diagonal assembly

* tap - add t538 exclusion because OCCA does not support galleries

* tests - adjust test cases for ceed examples for test coverage

* Op - fix documentation

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CUDA/MAGMA - add AssembleLinearQFunction (#553)

* CUDA - refactor operator apply for CUDA assemble linear QF impl

* CUDA/MAGMA - add AssembleLinearQFunction

* make style

* CUDA - clean up a

CUDA/MAGMA - add AssembleLinearQFunction (#553)

* CUDA - refactor operator apply for CUDA assemble linear QF impl

* CUDA/MAGMA - add AssembleLinearQFunction

* make style

* CUDA - clean up assembleLinearQF after q/e layout refactor

* CUDA - fallback operator for cuda/gen to cuda/ref

* CUDA - use delegation for cuda/gen prefered memtype

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