doc: add livehtml target for sphinx-autobuild

Merge pull request #707 from CEED/add-gpu-arch-opts

add CUDA_ARCH and HIP_ARCH options

add CUDA_ARCH and HIP_ARCH to CONFIG_VARS

add CUDA_ARCH and HIP_ARCH options

Merge pull request #699 from CEED/hip-mem-updates

Improve hip-shared memory usage

remove constant memory usage for hip-shared

Merge pull request #674 from CEED/jed/static-link

static link

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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Merge pull request #668 from CEED/natalie/hip-shared-gen

Add hip-shared and hip-gen backends

add CEED_UNUSED to avoid warnings for hipblas error checking

add flag to ignore unused function warnings

make tidy changes for HIP

add initial ported hip-shared and hip-gen backends

Merge pull request #659 from CEED/xlc-add-c++11-flag

Add the C++11 flag to the XL C++ flags

Add the C++11 flag to the XL C++ flags.

Merge pull request #656 from CEED/jeremy/magma-ci

MAGMA - re-enable MAGMA CI on GitLab

MAGMA - re-enable MAGMA CI on GitLab

Merge pull request #633 from CEED/icl/hip-magma

enable HIP mode for MAGMA backend

resolve merge conflicts for v0.7 release

Make - update make info with better backend name display (#639)

Make - add cpp files to code coverage (#638)

Merge pull request #634 from CEED/jeremy/occa-order

OCCA - update backend resource names to match other GPU backends

minor - update documentation on memcheck backend

MAGMA - update backend names to new convention

OCCA - update backend resource names to match conventions