add test of error output dm_impls_plex_tests-ex18_9_seq_hdf5_simple_int_err

ex18: TestExpandPoints: Improve output.

* Check DMPlexExpandedConesToFaces_Private.
* Don't mix use of singleton viewer and PetscViewerASCIISynchronizedPrintf on the original one.
* Fix missing Flush

ex18: DMPlexExpandedVerticesCoordinatesToFaces_Private: use zero tolerance

DMPlexFindVertices: optimize tolerance=0.0

DMPlexFindVertices: check coordinate section dim separately and only in debug mode

ex18: better placement of DMPlexOrientInterface_Internal call

ex18: update tests TODOs

ex18: add DMPlexCheckPointSFHeavy: Detect partition interface and compare with PointSF.

* Use DMPlexMarkBoundaryFaces() and DMPlexFindVertices().
* Tests any combination of distribution and interpol

ex18: add DMPlexCheckPointSFHeavy: Detect partition interface and compare with PointSF.

* Use DMPlexMarkBoundaryFaces() and DMPlexFindVertices().
* Tests any combination of distribution and interpolation; we only require that a serial version of the plex can be created.
* Print a message so that we know it is in use.
* Add DMPlexSetOrientInterface_Private so that DMPlexInterpolate can be done without DMPlexOrientInterface.
* Add & employ PortableBoundary which packs coordinates & section together.
* If missing/extra points are detected, view cones of wrong points; print vertices with coordinates.

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ex18: tests 7% and 9% restructuralized

ex18: separate 6% tests with serial/parallel interpolation

DMPlexCreateFromFile: Call PetscViewerSetFromOptions.

So that we are able to set options like -dm_plex_create_viewer_hdf5_collective.

Merge remote-tracking branch 'origin/maint'

Merge branch 'haplav/fix-doc-dmplexstratify' into 'maint'

Minor fix of DMPlexStratify manpage.

See merge request petsc/petsc!2287

Plex: Squash uninitialized variable warning

Minor fix of DMPlexStratify manpage.

$ must start the line to be typeset as monospace.

Merge remote-tracking branch 'origin/maint'

DM: fix spelling "Glocal" and old DMDA -> DM

prototype for ViewFromOptions macro-->functions

Merge branch 'tisaac/fix-some-plex-tests' into 'master'

Some quick plex test fixes

See merge request petsc/petsc!2206

Merge branch 'haplav/feature-petscsortedint' into 'master'

PetscFind{Int,MPIInt,Real}: Check in debug mode whether input array is sorted.

See merge request petsc/petsc!2248

Sanitize names for vtk ascii format: no spaces

Revert fluent test that fails on non-linux systems

DMPlexCheckPointSF: We need to allow mixed sharing of points in the interface

- This means if a face is a leaf (ghost), we could still own one of its faces
- This is necessary for good load balance,

DMPlexCheckPointSF: We need to allow mixed sharing of points in the interface

- This means if a face is a leaf (ghost), we could still own one of its faces
- This is necessary for good load balance, see the PR from Florian/Patrick/Lawrence

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DMPlexCreatePointSF: manpage notes SF has sorted locals

Interpolation required in dmplexcheckfaces