DMLabel: Validate/build point arrays per stratum

Keep a "valid" flag and sorted point array per stratum to avoid
unnecessary re-creation/sorting of point arrays for clean strata.
This improves perfo

DMLabel: Validate/build point arrays per stratum

Keep a "valid" flag and sorted point array per stratum to avoid
unnecessary re-creation/sorting of point arrays for clean strata.
This improves performance of DMPlex stratification and scalability
of label-based partitioning.

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Remove XXXRegisterAllCalled from public interface.

All XXXRegisterAll() methods are now idempotent, so a boolean indicating
whether they can be called or not is no longer necessary.

Merge branch 'knepley/fix-plex-orient'

* knepley/fix-plex-orient:
Plex: Remove superfluous argument in orientation

Plex: Remove superfluous argument in orientation

Plex: Reorganized Latex output

DMPlex: support uniform refinement of intervals

Somewhat cargo-culted from the existing 2D simplex code.

DMPlex: make CellRefiner an enum rather than PetscInt

Plex: Remove obsolete partitioning routines

Removed:
* DMPlexEnlargePartition
* DMPlexMarkTreeClosure
* DMPlexCreatePartitionClosure
* PetscSFConvertPartition

Plex: Fix deadlock in DMPlexCreatePointNumbering

Use dim instead of depth for unstratified meshes.

Plex: Fix dynamic check for one-to-all pattern in DMPlexMigrate

Check if the current point SF graph has been set (nroots > -1).

Merge branch 'knepley/fix-plex-orient'

* knepley/fix-plex-orient:
Plex: Fix serial orientation
TetGen: Syntax fix
Plex: Fix MPI type for orientation
Plex: Small orientation fix
Plex ex13:

Merge branch 'knepley/fix-plex-orient'

* knepley/fix-plex-orient:
Plex: Fix serial orientation
TetGen: Syntax fix
Plex: Fix MPI type for orientation
Plex: Small orientation fix
Plex ex13: Orientation now working for flipped connected components
Plex: Reworked orientation to respect connected components on each process
Plex ex13: Check in initial output
Plex: Now mark initial cell as seen - Changes the outcome slightly
Plex: Added DMPlexCheckFace_Internal() - This checks a face in the mesh for orientation consistency
Plex: Fix orientation diagnostics
Plex: Added declaration for DMPlexReverseCell()
Plex ex13: Tests orientation - Only 2D triangle tests now - Last test shows problem for disconnected domains
Plex: Small example fixes
PetscBT: Do not overwrite a viewer passed to PetscBTView()
Plex: Remove unneeded headers
Plex: Added a file for orientation calculations - Moved DMPlexOrient()

Conflicts:
src/dm/impls/plex/plex.c

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Merge branch 'knepley/feature-perf-api'

* knepley/feature-perf-api:
Sys: Add header entry for PetscLogEventGetPerfInfo
Plex ex9: Updated to new logging interface
Sys: Added PetscLogEventGetPer

Merge branch 'knepley/feature-perf-api'

* knepley/feature-perf-api:
Sys: Add header entry for PetscLogEventGetPerfInfo
Plex ex9: Updated to new logging interface
Sys: Added PetscLogEventGetPerfInfo()

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Plex: Added Fortran binding for DMPlexCreateFromFile()

Merge branch 'mlange/plex-gmsh-binary'

* mlange/plex-gmsh-binary:
Viewer: Fix 64-bit integer parse
Plex-Gmsh: Improve error handling
Viewer: Use %lld to parse 64-bit integers
Plex-Gmsh: Fixe

Merge branch 'mlange/plex-gmsh-binary'

* mlange/plex-gmsh-binary:
Viewer: Fix 64-bit integer parse
Plex-Gmsh: Improve error handling
Viewer: Use %lld to parse 64-bit integers
Plex-Gmsh: Fixes for 64-bit integer mode
Plex-Gmsh: Fix and test parallel Gmsh reads
Plex-Gmsh: Add new Gmsh tests based on 2D square
Plex-Gmsh: Add DMPlexCreateGmshFromFile, which determines file type
Plex-Gmsh: Enabling binary mesh file reads in DMPlexCreateGmsh
Viewer: Add PetscViewerRead()
Plex-Gmsh: Adding PetscViewerASCIIRead()
Plex-Gmsh: Read gmsh elements into memory for repeated file traversal.
Plex-Gmsh: Fix cell and dimension counting

Conflicts:
src/dm/impls/plex/plexgmsh.c

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Plex: Fix serial orientation

TetGen: Syntax fix

Plex: Fix MPI type for orientation

Plex: Small orientation fix

Plex ex12: Enable L2-overlap test and switch to ascii_info_detail

Plex ex1: Fix overlap tests and switch to ascii_info_detail

Plex: Fix and clean up DMPlexCreatePointSF

Plex: Correctly restore closure in DMPlexPartitionLabelClosure

Plex: Let SegBuffer allocate partition graph to avoid memory corruption

Plex ex13: Orientation now working for flipped connected components

Plex: Reworked orientation to respect connected components on each process