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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spellcheck

Ceed - add IsDeterministic

backends/avx: use FMA instructions when supported

CPU - add comment blocks at top of all backend functions

AVX - remove duplicate zeroing

Codecov Exceptions (#356)

* Tests - Add lcov exceptions to t304-f/t305-f

* Backends - add lcov exceptions for error messages intentionally not tested

* Interface - add lcov exceptions for erro

Codecov Exceptions (#356)

* Tests - Add lcov exceptions to t304-f/t305-f

* Backends - add lcov exceptions for error messages intentionally not tested

* Interface - add lcov exceptions for error messages intentionally not tested

* Tests - additional lcov exceptions

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Update CPU backends to give default for /cpu/self/***

Update Ceed Delegate refrencing

Use blocking in optimized serial backends

Fix include statements

Add kernel caching to XSMM backend

Make style and comment updates

XSMM tensor ind logic fix

Logic cleanup

Add Basis argument to TensorContractCreate

Add CeedTensorContract object (#211)

Serial and Blocked AVX Backends (#198)

* Add serial AVX backend

* Style and README changes

* Simplify AVX serial tensor loop

* Minor performance improvement

* C=1 AVX scalar case

* In

Serial and Blocked AVX Backends (#198)

* Add serial AVX backend

* Style and README changes

* Simplify AVX serial tensor loop

* Minor performance improvement

* C=1 AVX scalar case

* Increase use of AVX commands for edge cases

* Prep for eventual Tensor Object

* Comment updates

* Readme update

* Update README

* Refactor to reduce code

* Increase vectorization in remainder of columns

* Vectorize column remainder on C=1 case

* Switch to static inlining for AVX tensor contract

* Tidying for merge

* make style

* Style cleanup

* Full register use for columns

* Make style

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Apply style changes

Backend naming adjustment

avx vectorized backend

Edge cases for AVX BasisApply

Priority adjustment to match libXSMM branch

Remove scalar/simd mix for Intel

Check for CC AVX support

AVX: proposed doc and makefile detectio

avx vectorized backend

Edge cases for AVX BasisApply

Priority adjustment to match libXSMM branch

Remove scalar/simd mix for Intel

Check for CC AVX support

AVX: proposed doc and makefile detection update

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