style - change Get*Status to Is*

Doc - fix L-vector indexing in dev docs (#557)

* Doc - fix L-vector indexing in dev docs

* Doc - fix same issue in ElemRestriction doc

Improve Developer Documentation (#556)

* doc - document l/e/q vector layouts and object inheritance

* doc - clean up some referencing

* doc - fix some reference errors

* doc - fix enumerati

Improve Developer Documentation (#556)

* doc - document l/e/q vector layouts and object inheritance

* doc - clean up some referencing

* doc - fix some reference errors

* doc - fix enumeration in inheritance list

* doc - include note for dissimilar E/Q layouts

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Convert CUDA ref/reg/shared E-Layout (#554)

* tests - update tests for multiple e-layouts

* CUDA - convert ref and reg restrictions to Q-layout

* CUDA - ref/reg/shared use gen/magma E-Layout f

Convert CUDA ref/reg/shared E-Layout (#554)

* tests - update tests for multiple e-layouts

* CUDA - convert ref and reg restrictions to Q-layout

* CUDA - ref/reg/shared use gen/magma E-Layout for multi elememnt basis apply and operator apply

* CUDA/MAGMA - drop eandqdiffer and separate MAGMA operator code

* CUDA - update operator comment

* reg - clarify read/write dofs/quads

* CUDA - drop dead code

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Merge branch 'master' into valeria/NSfixes

Merge pull request #523 from CEED/jed/breathe-4.17

Jed/breathe 4.17

doc: add @ref for enum mentions

Merge pull request #520 from CEED/jeremy/restriction-host-offsets

CeedElemRestrictionGetOffsets

ElemRestriction - add check for strided status

ElemRestriction - add state counter for reading offsets array

ElemRestriction - add ElemRestrictionGetOffsets

Merge pull request #513 from CEED/jeremy/restriction-no-interlace

Convert restriction to offsets

Restriction - convert restiction to use offsets instead of interlace mode. CPU and Python impl only, CUDA and MAGMA left to do.

Merge pull request #473 from CEED/jeremy/restriction-doc

Restriction - reorder ceed-elemrestriction.c for Doc

Restriction -reorder ceed-.l.mrestriction.c to get correct documentation grouping

Merge pull request #446 from CEED/user-manual

Sphinx user manual published at libceed.readthedocs.io

doc: convert to Sphinx documentation at libceed.readthedocs.io

Some technical notes about the expanded docs/process:

* Doxygen is now restricted to API documentation. Sphinx docs are
incomplete

doc: convert to Sphinx documentation at libceed.readthedocs.io

Some technical notes about the expanded docs/process:

* Doxygen is now restricted to API documentation. Sphinx docs are
incomplete surrogates due to not hyperlinking code listings, though
we hope the Doxygen site can be removed eventually.

* PDF output uses XeTeX (unicode and OTF fonts) with TeX Gyre Pagella
and DejaVu Sans Mono. You may need to install these fonts in order
to build the PDF users manual.

* Obtaining the author list from Git has not worked on
ReadTheDocs (`git shortlog` is empty even though `git log` is not),
so we automatically generate it on developer machines with `make
doc`. If the author information is incorrect/mangled, edit .mailmap
to fix the mapping.

* Math semantics are based on the description here
https://github.com/sphinx-doc/sphinx/issues/3785

Sphinx chooses one of two setups for the maths.

* If there is a single equation, then we wrap the maths in
\begin{equation*} (or equation).

* If there are multiple equations (as determined by the presence of
an empty line), then we wrap the maths first in \begin{aligned}
and then in \begin{align*} (or align).

Co-authored-by: Jeremy L. Thompson <jeremy.thompson@colorado.edu>
Co-authored-by: Jed Brown <jed@jedbrown.org>

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doc: separate Doxygen groups by Public API/Backend API/Internal Functions

Helped-by: Valeria Barra <valeriabarra21@gmail.com>
Squashed-by: Jed Brown <jed@jedbrown.org>

Merge pull request #456 from CEED/jeremy/strided-restriction

Strided Restrictions

make style

Interface - update constants to be const...ant

ElemRestriction - make strides const

Co-Authored-By: Jed Brown <jed@jedbrown.org>

ElemRestriction - add CEED_ELEMRESTRICTION_NONE so we can stop making dummy restrictions for CEED_EVAL_WEIGHT fields

Make style

Restriction - add CEED_STRIDES_BACKEND