Op - add AssembleAdd version of diagonal assembly functions, will be helpful for MFEM integration

Op - change LinearAssemble* to accept CeedVector instead of pointer to CeedVector, allows for less memory movement and interfaces with parent code better

Merge pull request #558 from CEED/jeremy/func-rename

Rename Functions

style - rename AssembleLinear* to LinearAssemble*

style - change Get*Status to Is*

Composite Operator support for AssembleLinearDiag/PBDiag (#552)

* ref - add composite operator support for building diagonal/pb diagonal

* ref - add error for non-composite mult-field operator di

Composite Operator support for AssembleLinearDiag/PBDiag (#552)

* ref - add composite operator support for building diagonal/pb diagonal

* ref - add error for non-composite mult-field operator diagonal/pb diagonal assembly

* tap - add t538 exclusion because OCCA does not support galleries

* tests - adjust test cases for ceed examples for test coverage

* Op - fix documentation

show more ...

CPU Impl of AssemblePointBlockDiagonal (#503)

* Operator - add AssemblePointBlockDiagonal for CPU backends, with test

* CUDA - add point block diagonal not supported message

* make style

*

CPU Impl of AssemblePointBlockDiagonal (#503)

* Operator - add AssemblePointBlockDiagonal for CPU backends, with test

* CUDA - add point block diagonal not supported message

* make style

* Operator - improve point block description

* OCCA - explicitly remove OCCA fallback to CPU assembly functions, will update after new OCCA backend

* Op - remove gap removal in point block diagonal

* Op - update diagonal assembly documentation

* Update backends/ref/ceed-ref-operator.c

Co-authored-by: Jed Brown <jed@jedbrown.org>

* style - fix extra space in * with nopad

Co-authored-by: Jed Brown <jed@jedbrown.org>

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Merge pull request #549 from CEED/jeremy/op-qf-test

Operator - expand check for valid QFunction

Operator - expand check for valid QFunction

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 #497 from CEED/jeremy/more-codecove

codecov - add a couple of more exclusion tags

codecov - add a couple of more exlcusion tags

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

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

Merge pull request #447 from CEED/jeremy/lmode-on-create

ElemRestriction Lmode in Create over Apply

ElemRestriction - move lmode to constructor over apply

Merge pull request #436 from CEED/jeremy/diag-refactor

AssembleLinearDiag Optimizations

Operator - fix fallback ceed mem leak

Merge pull request #431 from CEED/jeremy/diag-refactor

Operator - move AssembleDiagonal to fallback

Doc - update doc for make doc errors