petsc - update for PetscOptionsBegin/End

minor - update copyright headers

vec - use CeedSize for vector lengths

pc - use PetscCount/ptrdiff_t for num COO entries

examples/petsc: let DMSetFromOptions manage distribution

Sphere meshes are automatically snapped to the unit sphere when refined.

I left explicit partitioning in solids (though Ratel uses the new
p

examples/petsc: let DMSetFromOptions manage distribution

Sphere meshes are automatically snapped to the unit sphere when refined.

I left explicit partitioning in solids (though Ratel uses the new
paradigm) because it has documented command-line arguments and maybe
someone wants to know how to avoid this distribution.

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petsc - use SETERRQ over SETERRQ1

examples: skip DMPlexLabelComplete now that PETSc does not need it

ex - better namespacing of petsc ex headers

Merge pull request #885 from CEED/jeremy/min-petsc

PETSc - set minimum version for examples

examples/petsc: avoid namespace collision in convenience headers

petsc - drop mat assembly by coloring

examples/petsc/multigrid: add event for assembly

examples/petsc/multigrid: assemble matrix analytically instead of coloring

This currently requires development PETSc to correctly handle negative
indices through the LocalToGlobalMapping.

petsc - set minimum version for examples

style - make qf/op field names human readable

petsc - use DMPlexGetLocalOffsets for building restrictions

vec/qf - initial valid/borrowed/owned split for data (#853)

* vec/qf - initial valid/borrowed/owned split for data

* vec/qf - tidy logic for checking active/stale data

* minor - add missing NU

vec/qf - initial valid/borrowed/owned split for data (#853)

* vec/qf - initial valid/borrowed/owned split for data

* vec/qf - tidy logic for checking active/stale data

* minor - add missing NULL

* doc - explain VectorTakeArray update

* minor - update error messages

* test - update error message in junit/tap

* gpu - fix stray CeedScalar vs void for QFunctionContext

* vec/qf - clarify/simplify access logic

* vec - calloc host arrays when no value set to make empty

* style - minor

* style - minor

* minor - fix error messages

* vec/qf - move data validity checking to backend interface

* gpu - add missing sync error checking for qfcontext

* gpu - homogonize use of impl for backend data to reduce confusion

* vec - clarify access conditions

* python - update test for stricter vector access

* vec - minor fixes

* minor - fix ipython change

* vec - add missing declarations in ceed/backend.h

* ctx - mirror vector borrowed data check in ctx interface

* vec - add CeedVectorGetArrayWrite

* vec - consistent use of CeedVectorGetArray vs CeedVectorGetArrayWrite

* python - small vec fixes

* doc - describe vector data semantics

* magma - update restriction

* gpu - fix restr bug I added, need to sum into target

* magma - fix restriction bug

* cpu - fix restriction bug here too

* op - fix evec allocations

* julia - fix ElemRestriction for new vector access rules

* op - double check GetArray vs Read vs Write usage

* doc - small fix

* restr - clean up read/write logic for restr

* python - add vec.array_write

* magma - typo fix

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petsc - use PetscFECreateLagrange

qf - drop unneeded guards on math.h

tests: match bpsraw tolerance to bps

doc: move from {math:numref} to {eq} (no visual change)

doc: replace recommonmark with MyST and migrate ReST to MyST

This offers more familiar syntax for most writing, as well as natural
$\pi$ math (versus :math:`\pi`) and markdown syntax for all ReST
fe

doc: replace recommonmark with MyST and migrate ReST to MyST

This offers more familiar syntax for most writing, as well as natural
$\pi$ math (versus :math:`\pi`) and markdown syntax for all ReST
features.

The API doc stubs remain in ReST as recommended for autodoc.

https://myst-parser.readthedocs.io/en/latest/sphinx/use.html#use-sphinx-ext-autodoc-in-markdown-files

The change was largely implemented using
https://github.com/executablebooks/rst-to-myst/ with some manual
fix-ups. Tables (both ReST built-in tables and list-table) remain under
eval-rst until they can be manually updated.

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git - add *.a to petsc gitignore

make: consolidate examples/petsc utilities into library to avoid races

Parallel recursive make races itself building the utilities when
creating multiple executables, so consolidate so invocations n

make: consolidate examples/petsc utilities into library to avoid races

Parallel recursive make races itself building the utilities when
creating multiple executables, so consolidate so invocations never build
overlapping targets.

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petsc - fix deps for parallel build of petsc example