Copy Ref updates to MAGMA

[WIP] Start converting MAGMA and COOA backends

Add backend prioritization

magma: make style (mixed results)

Merge branch 'magma-dev' of https://github.com/CEED/libCEED into magma-dev

mollowing discussion and agreement, remove for now /cpu/magma as support is provided through /gpu/magma

Additional tweaks for building using IBM XL Fortran.

change of the generator to reflect bug fix and improved kernel (from Azzam; Thanks)

add missing restores; fix t30 test - it was assuming allocation initializes values to 0; bug fixes thanks to Azzam; control of templates to be done on CPU or GPU

some defines that control what goes through GPU code

add macro for debugging CUDA kernels

add atomics.cuh in the backened. Before was in magma and this was creating problem for spack

TODO: Need to define CeedDebug...

[magma-dev] Tweaks in Makefile. Fix formatting to suppress warnings.

Copyright banners, few other small changes

make style

modify properly the ceed-magma

add two more file for the magma backend; porting single tensor contraction call

remove some wornings

port ElemRestriction using generator; use also atomics in the generation for the += case

add include atomics to generated file

Update restriction Destroy and Create. Still passes the tests but with 4 warnings - by design create takes indices as const, but in case ownership is passed, we later have to free them so can not dec

Update restriction Destroy and Create. Still passes the tests but with 4 warnings - by design create takes indices as const, but in case ownership is passed, we later have to free them so can not declare them as const in the magma function. Next, port apply ...

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extend CeedVector_Magma to get input from DEVICE. Vector functionality now passes the make test routines. About to add spacifics for CeedElemRestriction_Magma

bug fixes and extend functionality of the generation tool to handle from one to three nested loops

add some comments