DMPlexLoad_HDF5_Xdmf_Internal: don't load labels for now

Merge branch 'knepley/feature-snes-patch' [PR #1332]

* knepley/feature-snes-patch:
Implement SNESPATCH, a SNES for the topological construction of nonlinear relaxation methods.

SNES PATCH: Removed unused FVM-related variables.

gmakegentest: Support for `requires: long{32|64}`

Fix bogus plus operator within increment in for loop

DMPlex: Add tests for Gmsh v2/v4 ascii/binary reader

DMPlex: Update reader for Gmsh v4 file format

Merge remote-tracking branch 'origin/knepley/fix-distribute-check' into maint

Some cleanups of Matt's FVM code

Remove some of Matt's dead code

Merge branch 'knepley/feature-plex-check-options'

valgrind: fix warnings

not ok diff-dm_impls_plex_tests-ex3_p1d_2d_3
# 0a1,9
# > ==28708== Conditional jump or move depends on uninitialised value(s)
# > ==28708== at 0x5D481FF: DMSetFromOptions_N

valgrind: fix warnings

not ok diff-dm_impls_plex_tests-ex3_p1d_2d_3
# 0a1,9
# > ==28708== Conditional jump or move depends on uninitialised value(s)
# > ==28708== at 0x5D481FF: DMSetFromOptions_NonRefinement_Plex (plexcreate.c:2295)
# > ==28708== by 0x5D49B51: DMSetFromOptions_Plex (plexcreate.c:2396)
# > ==28708== by 0x6065CB5: DMSetFromOptions (dm.c:856)
# > ==28708== by 0x411CD0: CreateMesh (ex3.c:319)
# > ==28708== by 0x419B99: main (ex3.c:972)
# > ==28708== Uninitialised value was created by a stack allocation
# > ==28708== at 0x5D47AD9: DMSetFromOptions_NonRefinement_Plex (plexcreate.c:2269)

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Merge branch 'knepley/feature-multiple-ds' [PR #1309]

Merge branch 'haplav/feature-hdf5-improve-attribute-io'

Fix some Jenkins errors with careful compilers

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

Plex: Must cast initializer. I hate C++

Plex ex5: Remove unused options

Plex: Add options to DMSetFromOptions() that allow automatic checking of mesh
- Move all checking in examples into options

Plex: CheckFaces() should not go beyond the depth

Plex: Added DMPlexCheckGeometry()

DMLoad_Plex: be more careful about accepted PetscViewerFormats

Plex: Ghosted DM inherits setfromoptions state

Merge branch 'master' into knepley/feature-multiple-ds

* master: (156 commits)
Added missing CHKERRQ()
KSP ex56: Added alt output file for ex56_2.
Revert "KSP ex56: Updated test output and dom

Merge branch 'master' into knepley/feature-multiple-ds

* master: (156 commits)
Added missing CHKERRQ()
KSP ex56: Added alt output file for ex56_2.
Revert "KSP ex56: Updated test output and domain size for test _2."
DMStag tutorial ex4: fix stencil errors
Hierarchical partitioner: added an alt output file
Add support for DMGetMatrix() with periodic boundary conditions in one dimension for DMDA.
Fixed incorrect 'ntext' argument in PetscOptionsEList call in SNES ex12.c
ISCreateSubIS: Initialize variables owner and lidx to avoid compiler warnings
metis: provide -download-metis-use-doubleprecision option
KSP ex56: Updated test output and domain size for test _2.
Hierarchical partitioner: add a bit documentation
ISCreateSubIS: Added checkers for parameters
Added a test for hierarchical partitioning vertex weights
Plex+Doc: Document options for DMPlexCreateBoxMesh()
Hierarchical partitioner supports vertex weights
Create an API ISCreateSubIS that extracts
Add an alt output file
Plex: Can now give bounds to DMPlexCreateBoxMesh() from options - Use -dm_plex_box_lower and dm_plex_box_upper
PCMG: These methods should be optional
PCMG: Make PCMGGet/SetLevels() proper member functions - Also need to compose them in GAMG
...

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

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Plex ex11: As per DMPlexStratify(), all procs must have the "depth" label with the same number of (possibly) empty strata