Convert MPI error type to PETSc error with string message for all MPI calls

Now PETSc examples will ONLY return PETSc error codes and never MPI error codes directly so we can understand and post-pro

Convert MPI error type to PETSc error with string message for all MPI calls

Now PETSc examples will ONLY return PETSc error codes and never MPI error codes directly so we can understand and post-process their
errors better.

The test harness will now automatically retry tests that fail with MPI, this may help with Intel MPI that produces
seemingly random failures.

Commit-type: error-checking
/spend 30m

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Merge remote-tracking branch 'origin/release' into master

Merge branch 'jose/release/pgi-20.9-warnings' into 'release'

Fix warnings in NVIDIA compilers (formerly PGI)

See merge request petsc/petsc!3397

Fix warnings in NVIDIA compilers (formerly PGI): unreachable statement

Merge branch 'knepley/feature-swarm-mass-prec' into 'master'

Knepley/feature swarm mass prec

See merge request petsc/petsc!3132

Swarm: Added DMSwarmCreateMassMatrixSquare()

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

Fix 0 -> NULL for pointers

See merge request petsc/petsc!3086

DM: Replace 0 -> NULL for pointers

Merge branch 'knepley/feature-swarm-fortran' into 'master'

Knepley/feature swarm fortran

See merge request petsc/petsc!2680

DMSwarm: Enable Fortran and Xdmf viewing
- Added Fortran headers
- Added Fortran module
- Removed PETSC_EXTERN from source
- Turned on automatic Fortran bindings
- Now outputs particle locations in H

DMSwarm: Enable Fortran and Xdmf viewing
- Added Fortran headers
- Added Fortran module
- Removed PETSC_EXTERN from source
- Turned on automatic Fortran bindings
- Now outputs particle locations in HDF5
- These are parsed in Xdmf as a Polyvertex grid
- Can now view particle fields in HDF5

Co-authored-by: Mark Adams <mfadams@lbl.gov>

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Merge branch 'knepley/fix-plex-projection-label' into 'master'

Plex: This fixes a pernicious bug with projection - When setting points along...

See merge request petsc/petsc!2773

Plex: Abstract getting dof indices on closure
- Added DMPlexMatSetClosureGeneral()
- Changed interface for existing DMPlexGetClosureIndices()

Merge branch 'stefanozampini/fix-dm-composition' into 'master'

Fix DM composition with work vectors and matrices

See merge request petsc/petsc!2551

DM: add interface consistency checks

fix various classes

Merge branch 'knepley/feature-project-different-spaces' into 'master'

Knepley/feature project different spaces

See merge request petsc/petsc!2153

FE+DS: Introduce PetscTabulation to hold tabulated function data
- This was created to prevent mismatches in sizes I was getting by just
passing around arrays
- FE+FV+DS now hold tabulations
- GetTab

FE+DS: Introduce PetscTabulation to hold tabulated function data
- This was created to prevent mismatches in sizes I was getting by just
passing around arrays
- FE+FV+DS now hold tabulations
- GetTabulation() --> CreateTabulation() and it creates an object rather
than using DMGetWorkArray(). I put in ComputeTabulation() to reuse
space, but there still may be performance regression.
- Default tabulations are now "cell tabulations"
- The replicas in the tabulation are used to index faces in a face
tabulation

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Merge branch 'knepley/fix-swarm-pid-size' into 'master'

Knepley/fix swarm pid size

See merge request petsc/petsc!2259

Swarm: There does not seem to be a reason to keep pid as PETSC_LONG, changing to PETSC_INT - This will prevent different size on Solaris - Whitespace

Merge branch 'knepley/feature-convest-ts' into 'master'

Knepley/feature convest ts

See merge request petsc/petsc!2190

DMSwarm: Get rid of direct printing

Merge branch 'master' into this one.

Merge branch 'barry/2019-09-01/rm-default-language-from-dm' into 'master'

Update public API, and internal naming conventions for DM to eliminate use of...

See merge request petsc/petsc!1998

Update public API, and internal naming conventions for DM to eliminate use of "default" (previously refered to default sections)

Commit-type: style-fix, documentation

Merge branch 'jed/deprecate-dmgetdefaultsection' [PR #1969]

* jed/deprecate-dmgetdefaultsection:
DMGetDefaultSection et al: add PETSC_DEPRECATED_FUNCTION
These functions were deprecated in v3.9, but

Merge branch 'jed/deprecate-dmgetdefaultsection' [PR #1969]

* jed/deprecate-dmgetdefaultsection:
DMGetDefaultSection et al: add PETSC_DEPRECATED_FUNCTION
These functions were deprecated in v3.9, but no PETSC_DEPRECATED_FUNCTION was added at that time so many uses crept back into the source code. Here we mark it deprecated and fix all existing uses in PETSc.

DMGetLocalSection/DMSetLocalSection: add explicit names for DMGetSection/DMSetSection
These names are for symmetry with DMGetLocalVector() versus DMGetGlobalVector().

DMGetSection: replace all internal usage with DMGetLocalSection
Same for DMSetSection -> DMSetLocalSection. We retain the interface for DMGetSection/DMSetSection without deprecation warnings (for now).

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DMGetSection: replace all internal usage with DMGetLocalSection

Same for DMSetSection -> DMSetLocalSection. We retain the interface
for DMGetSection/DMSetSection without deprecation warnings (for n

DMGetSection: replace all internal usage with DMGetLocalSection

Same for DMSetSection -> DMSetLocalSection. We retain the interface
for DMGetSection/DMSetSection without deprecation warnings (for now).

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

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