Makefile: support CUDA stubs and LDFLAGS override

Co-authored-by: Stefano Zampini <stefano.zampini@gmail.com>

Merge pull request #923 from CEED/natalie/simplify-magma-atomics

MAGMA: simplify atomic add usage, improve installation

MAGMA: simplify atomic add usage and reduce MAGMA header file usage

Merge pull request #858 from CEED/jeremy/dump-copy-stuff

Strip redundant/outdated license info duplication

minor - update copyright headers

Merge pull request #917 from CEED/jed/makefile-avx-cflags

Visibility and AVX flag detection

Makefile: AVX detection needs CFLAGS

Package managers (Spack, PETSc --download-libceed) will typically
specify CFLAGS directly rather than using the OPT= shortcut. The test
needs to use the flags th

Makefile: AVX detection needs CFLAGS

Package managers (Spack, PETSc --download-libceed) will typically
specify CFLAGS directly rather than using the OPT= shortcut. The test
needs to use the flags they set, not our default (which includes
-march=native).

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Merge pull request #906 from CEED/jeremy/small-make-fix

make - fix env BACKENDS detection

make - fix env BACKENDS detection

Merge pull request #893 from CEED/natalie/more-hip-launch-bounds

HIP: add atomics flag and more kernel launch bounds for performance improvements

Add flag to use atomic adds on supported AMD GPU hardware

Merge pull request #879 from CEED/jed/doxygen-cleanup

Doxygen cleanup

Makefile: quiet Doxygen output so warnings are more noticeable

Merge pull request #863 from CEED/jeremy/gpu-jit-code

GPU - separate common code into separate folder

gpu - split common cuda/hip data into separate folder

Merge pull request #838 from CEED/jeremy/iwyu

Fix iwyu target

make - fix iwyu target

Merge pull request #831 from CEED/jeremy/minor-typo

doc - minor typo

make - add iwyu makefile target

Merge pull request #833 from CEED/jeremy/minor-verbose

makefile - respond to either V or VERBOSE

makefile - respond to either V or VERBOSE

Merge pull request #820 from CEED/jeremy/warn-occa

Add OCCA backend warning

minor - remove deprecated headers

Allow CeedScalar to be single precision (#788)

One can modify `ceed.h` to include `ceed-f32.h` and then use single precision. This is tested for C in CI and has been tested by developers with Rust,

Allow CeedScalar to be single precision (#788)

One can modify `ceed.h` to include `ceed-f32.h` and then use single precision. This is tested for C in CI and has been tested by developers with Rust, Julia, and Python. This interface is evolving and should be considered experimental at this time (thus lack of automated build support).

* Introduce CeedScalarType enum

* WIP changes to allow different definitions of CeedScalar

* Introduce new header files for float and double

* Only use avx tensor contract and MAGMA non-tensor basis if CeedScalar is double

* WIP changes to allow CeedScalar to be float

* WIP start trying to adjust test tolerances for float or double

* fix typos in comments

* install ceed-f32/64 headers

* Fix missing casts for hipMAGMA element restrictions

* make CeedQFunctionContextGetContextSize available for Python bindings

* Changes to Python bindings to allow CeedScalar to be float

* WIP adjust Python tests for float or double

* make style

* remove QFunctionContextGetContextSize from backend header

* Use quotes instead of <> in include statement

* Remove unncessary includes

* Update tolerances for tests

* [Julia] allow CeedScalar to be Float32

* [Julia] Use Preferences instead of custom build configuration

# Conflicts:
# julia/LibCEED.jl/src/C.jl

* [Makefile] Change definition of CC_VENDOR so it works with cross-compilation

* [Julia] Use Preferences in CI

# Conflicts:
# .github/workflows/julia-test-with-style.yml

* [Julia] Update docs about preferences

* [Julia] Add test/Project.toml workaround for Preferences

* Add CeedGetScalarType to get the type of CeedScalar at runtime

* [Julia] Move functions from Ceed.jl to LibCEED.jl

* [Julia] Add support for getting library path and scalar type at runtime

* [Julia] Minor change to checking if CUDA is loaded

* [Julia] Check correct CeedScalar types in basis functions

* [Julia] Fix tests comparing with output file

* [Julia] Change devtests to use CeedScalar instead of Float64

* Update test 402 so context will be same size in double or float

* Update tolerances for ceed examples

* [Julia] CUDA fixes

* remove unused variable in t208

* SchurDecomposition: do not compute tau on final iteration

* Update tolerances for some basis tests (for single precision)

* Make style

* Python style fixes for basis test

* Add single precision output for t300 and t320 and adjust checks; skip t541 in single

* Add LCOV exclusions after moving to new line

* fix spacing

* Python: make CEED_EPSILON available as libceed.EPSILON

* Python: optional parameter to specify different output file for test comparison

* Python: update tests' use of EPSILON and change test_300 output file for single precision

* Python: add convenience function for getting dtype corresponding to CeedScalar

* rust - add single precision support

* [Julia] Fall back on Float64 if CeedGetScalarType is not available

* [Julia] style

* Adjust tolerance for t301

* xsmm - add single precision support

* avx - add single precision support

* Add initial single precision support for MAGMA non-tensor basis

* Skip t300 and t320 in single precision; revert Python t300 changes

* Revert output changes for t300 and t320 in junit

* [Julia] Changes to autogenerated bindings for mixed precision

* [Julia] style

* [Julia] Check scalar type when changing libceed library path

The check is also performed when the package is loaded. This prevents having to
restart the Julia session twice

* [Julia] Require JLLWrappers version 1.3

This is needed to use Preferences to change the library path

* Add documentation page for precision development

Co-authored-by: Will Pazner <will.e.p@gmail.com>

* Cleanup from merge: remove old README

* Return CEED_ALIGN to backend.h

* Make Fortran compiler (FC) optional; empty skips Fortran tests

Use in Python and Rust builds, which may not have a Fortran compiler
installed and thus would produce confusing output.

* Add single precision CI test for Noether

Co-authored-by: Jeremy L Thompson <jeremy@jeremylt.org>

Co-authored-by: Will Pazner <will.e.p@gmail.com>
Co-authored-by: Jeremy L Thompson <jeremy@jeremylt.org>
Co-authored-by: Jed Brown <jed@jedbrown.org>

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Merge pull request #803 from CEED/jed/test-junit

testing updates: junit classname, bpsraw tolerances, CUDA on lv