Merge branch 'barry/2021-05-16/fix-double-lines' into 'main'

Fix typos in source

See merge request petsc/petsc!3984

Remove all double blank lines from source

Commit-type: petsc-style
/2h

Merge branch 'dalcinl/fix-null' into 'master'

KSP/PC: Fix 0 ->NULL for pointers

See merge request petsc/petsc!2794

KSP/PC: Fix 0 ->NULL for pointers

Merge remote-tracking branch 'origin/psanan/docs-remove-manconcepts' [PR #1733]

Man pages: remove Concepts: fields

These fields were previously stripped from the man pages by logic removed in
21a59cba2737d49dc2f0bd12c08db0d2a3f3f209

Remove these fields from all man pages (but

Man pages: remove Concepts: fields

These fields were previously stripped from the man pages by logic removed in
21a59cba2737d49dc2f0bd12c08db0d2a3f3f209

Remove these fields from all man pages (but not from examples).

This is accomplished with GNU sed (gsed on OS X), with the following commands.
*Warning* that this type of command can corrupt a .git directory,
so be cautious in reusing or modifying these commands. They first look
for and delete matching lines with a following line consisting of only whitespace,
and then delete any remaining matching lines.

find src -type f -not -path "*/examples/*" -not -name "*.html" -not -name "*.bib" -exec gsed -i '/Concepts:/ {N; /\n\s*$/d}' {} +
find src -type f -not -path "*/examples/*" -not -name "*.html" -not -name "*.bib" -exec gsed -i '/Concepts:/d' {} +
find include -type f -not -path "*/examples/*" -not -name "*.html" -not -name "*.bib" -exec gsed -i '/Concepts:/ {N; /\n\s*$/d}' {} +
find include -type f -not -path "*/examples/*" -not -name "*.html" -not -name "*.bib" -exec gsed -i '/Concepts:/d' {} +

Hints on the sed command obtained from: https://unix.stackexchange.com/questions/100754/how-to-delete-a-specific-line-and-the-following-blank-line-using-gnu-sed

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Merge from master

Merged petsc/petsc into master

Merge branch 'master' into arcowie-rem/feature-error-logging

* master: (345 commits)
Update dev notes for the coming release
Increase patchlevel to 3.9.4
doc fixes
Added some AIJSELL tests t

Merge branch 'master' into arcowie-rem/feature-error-logging

* master: (345 commits)
Update dev notes for the coming release
Increase patchlevel to 3.9.4
doc fixes
Added some AIJSELL tests that mirror the SELL tests.
Bib: More refs
Removed use of hardwired -1 to represent PETSC_NULL_XXX object, since the null value is now 0.
fix memleaks flagged by valgrind
ex62: disable long running test and workaround differences in iteration counts on various builds.
Add FAQ we can point to when users get error messages such as: "PETSc was configured with one OpenMPI mpi.h version but now appears to be compiling using a different OpenMPI mpi.h version"
swith test from mpich to openmpi as mpich ch3:sock is unuserable per PetscShmCommGet()
DM: Forgot to move include statement
fix nightlybuild issues - disable hypre [for openmp] and fix uninitialized variables
tests: enable openmp and hwloc with one of the mumps tests
Default BoomerAMG smoothers
Configure: Revert changes from debb90c, so that we are back to the original Libmesh
Configure: Reverted change for Libmesh from 83cd5d7
Split vecimpl.h into vecimpl.h and vecscatterimpl.h
SNES ex62: Turned off some tests for other precisions and shortened output of sensitive tests
Use mmap to allocate the shared pthread barrier if available
Add configure test for functional mmap
...

Conflicts:
include/petscconvest.h
src/snes/examples/tutorials/ex13.c
src/snes/interface/snes.c
src/snes/utils/convest.c

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Merge branch 'master' into knepley/fix-superdm-is

* master: (123 commits)
Fix a few more Fortran objects to have their NULL value match the C NULL value
remove dead code
Add variable point blo

Merge branch 'master' into knepley/fix-superdm-is

* master: (123 commits)
Fix a few more Fortran objects to have their NULL value match the C NULL value
remove dead code
Add variable point block Jacobi for MPIAIJ matrix.
should not pass user contexts through CHKFORTRANNULLOBJECT in Fortran stubs
fix mpiuni test
Remove CHKFORTRANNULLOBJECTDEREFERENCE since it is no longer needed with Fortran null equal to C null
PETSCFEOPENCL: declare PetscFEGetTabulation_Basic as external
PETSCFEOPENCL: declare PetscFESetUp_Basic as external
Change Fortran null pointer to match C null pointer
one more fix
jenkins: run 'cleantest' after examples are run - to recover diskspace
logical order bug in diagbrdn update fixed, tests updated again
replace new -petscspace_order instances with -petscspace_degree
PETSCSPACETENSOR: clear up naming confusion of subspaces
regression.py: remove configure code related to old test suite - now that SLEPc no longer needs it
PetscSpaceSetup_Poly(): make idempotent
Plex ex3: update tests
Lift changes to defunct dtfe.c from [PR #1074]
PetscSpace_Tensor: clarification of vector-valued
PetscSpace_Tensor: allow height subspaces, fixes tabulation initialization
...

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Merge branch 'master' into knepley/feature-pc-patch

* master: (131 commits)
fix mpiuni test
PETSCFEOPENCL: declare PetscFEGetTabulation_Basic as external
PETSCFEOPENCL: declare PetscFESetUp_Ba

Merge branch 'master' into knepley/feature-pc-patch

* master: (131 commits)
fix mpiuni test
PETSCFEOPENCL: declare PetscFEGetTabulation_Basic as external
PETSCFEOPENCL: declare PetscFESetUp_Basic as external
one more fix
jenkins: run 'cleantest' after examples are run - to recover diskspace
logical order bug in diagbrdn update fixed, tests updated again
replace new -petscspace_order instances with -petscspace_degree
PETSCSPACETENSOR: clear up naming confusion of subspaces
regression.py: remove configure code related to old test suite - now that SLEPc no longer needs it
PetscSpaceSetup_Poly(): make idempotent
Plex ex3: update tests
Lift changes to defunct dtfe.c from [PR #1074]
PetscSpace_Tensor: clarification of vector-valued
PetscSpace_Tensor: allow height subspaces, fixes tabulation initialization
PetscSpace: add a dimension member
PetscSpaceSetDegree(): now take maxDegree argument
-petscspacepoly_tensor -> -petscspace_type tensor
PetscSpaceEvaluate_Polynomial(): fix temp array dependencies
PETSCSPACETENSOR: A generic tensor product of spaces.
PetscSpace: -petscspace_order -> -petscspace_degree
...

Conflicts:
src/dm/dt/interface/dtfe.c
src/snes/examples/tutorials/ex13.c
src/snes/examples/tutorials/ex17.c
src/snes/examples/tutorials/ex62.c
src/snes/examples/tutorials/output/ex62_bddc_quad.out
src/snes/examples/tutorials/output/ex62_fetidp_2d_quad.out
src/snes/examples/tutorials/output/ex62_fetidp_2d_tri.out
src/snes/examples/tutorials/output/ex62_fetidp_3d_hex.out
src/snes/examples/tutorials/output/ex62_fetidp_3d_tet.out

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Merged petsc/petsc into master

Merge branch 'barry/feature-PCVPBJACOBI'

Introduce a point block Jacobi preconditioner with variable sized blocks

Only SeqAIJ implemented so far, adding MPIAIJ is trivial

Thanks to Jed Brown for suggesting making the block sizes a propert

Introduce a point block Jacobi preconditioner with variable sized blocks

Only SeqAIJ implemented so far, adding MPIAIJ is trivial

Thanks to Jed Brown for suggesting making the block sizes a property of the matrix
Commit-type: feature
Reported-by: Ali Reza Khaz'ali <arkhazali@cc.iut.ac.ir>
Thanks-to: Jed Brown <jed@jedbrown.org>

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