Docs: refactor copying of classic docs

Instead of relying on Sphinx's html_extra_path functionality,
directly copy the required classic docs at the end of the build.
This has the advantages of requi

Docs: refactor copying of classic docs

Instead of relying on Sphinx's html_extra_path functionality,
directly copy the required classic docs at the end of the build.
This has the advantages of requiring less Sphinx knowledge for
readers of conf.py, and of delaying time-consuming copying of files
until the end of the docs build, which is useful for incremental
local development.

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Merge branch 'psanan/dmstag-expose-dmstagsentciltoindexlocal' into 'main'

DMStag: Expose DMStagStencilToIndexLocal() as public function

See merge request petsc/petsc!4180

DMStag: Expose DMStagStencilToIndexLocal() as public function

Expose this low-level, previously-private function at the developer level.

Merge branch 'barry/2021-07-09/add-dmdavecgetarraydofwrite' into 'main'

Add DMDAVecGetArrayDOFWrite() and DMDAVecRestoreArrayDOFWrite()

See merge request petsc/petsc!4161

Add DMDAVecGetArrayDOFWrite() and DMDAVecRestoreArrayDOFWrite()

Commit-type: optimization, example
\spend 10m
Reported-by: Rory Johnston <Rory.Johnston@nag.com>

Sys: add CHKERRCXX to convert C++ exceptions to petsc error codes

Merge branch 'knepley/fix-convest-logging' into 'main'

Plex+SNES+Convest: Small fixes for PyLith

See merge request petsc/petsc!4169

Plex: - DMPlexComputeBdResidualSingle now takes a PetscFormKey instead of explicit label/value/field arguments

Merge branch 'ksagiyam/plex_view_hdf5_section' into 'main'

add DMPlexSectionView()/Load() etc.

See merge request petsc/petsc!3620

docs testing: use petsc.pc instead of PETSc.pc

pkg-config conventions use lowercase and we would like to eventually
remove PETSc.pc (which currently exists for backward compatibility) so
we should g

docs testing: use petsc.pc instead of PETSc.pc

pkg-config conventions use lowercase and we would like to eventually
remove PETSc.pc (which currently exists for backward compatibility) so
we should give users consistent guidance on the preferred method.

Note that our current PETSc.pc process works so long as build and
install both happen on case-sensitive or both happen on case-insensitive
systems (in which case petsc.pc replaces PETSc.pc), but not when the
systems differ. Julia JLL build environment builds packages on
case-sensitive systems to be used by case-insensitive (OSX), and thus
needs to skip PETSc.pc to avoid a collision. One could imagine building
on case-insensitive OSX and using from case-sensitive, in which case we
would only have petsc.pc.

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Add CSV file format to petsc_tas_analysis.py

plex: add manual for DMPlexXXXView() and DMPlexXXXLoad()

Merge branch 'release'

Increase patchlevel to 3.15.2

Docs: FAQ: change question titles to sentence case

This is intended to make the page more readable,
and seems appropriate even lacking a general style rule about headings
being capitalized this way,

Docs: FAQ: change question titles to sentence case

This is intended to make the page more readable,
and seems appropriate even lacking a general style rule about headings
being capitalized this way, as these headings are most in the form of
complete sentences.

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Docs: FAQ: add hint to find large output/ directories

Give a sample "find" command to locate large output directories, but
don't go so far as to give the invocation to actually delete all these
dire

Docs: FAQ: add hint to find large output/ directories

Give a sample "find" command to locate large output directories, but
don't go so far as to give the invocation to actually delete all these
directories, as it seems risky to give people copy-pastable commands
which automatically delete many files in a tree.

Reported-by: Barry Smith <bsmith@mcs.anl.gov>

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Docs: FAQ: add authors to link for "Writing Scientific Software"

Reported-by: Barry Smith <bsmith@mcs.anl.gov>

Docs: FAQ: fix some typos

Thanks-to: Barry Smith <bsmith@mcs.anl.gov>

Docs: FAQ: edit entry on recommended per-core memory bandwidth

Thanks-to: Barry Smith <bsmith@mcs.anl.gov>

Docs: remove usage of isonum.txt

Docs: FAQ: remove unneeded initial sentence

Reported-by: Barry Smith <bsmith@mcs.anl.gov>

Merge remote-tracking branch 'origin/release'

doc: fix PETSc abbriv and move NEWS section

section: test PetscSectionView()/Load() with HDF5

ESSL: upgrade to 5.2 and above

As of ESSL 5.2, interfaces to functions like ?geev now match that of
standard LAPACK, where they previously had a different calling
convention.

Co-authored-by: Jed Br

ESSL: upgrade to 5.2 and above

As of ESSL 5.2, interfaces to functions like ?geev now match that of
standard LAPACK, where they previously had a different calling
convention.

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

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