fix missing CHKERRQ

Merged in dalcinl/plex-gmsh (pull request #1469)

DMPlex: Update Gmsh reader

Plex: Added CellRefinerGetAffineFaceTransforms_Internal()
- This gives the affine transforms from the lower dim cell and a face. Needed to get Hdiv working

Plex: Give cell refiners proper names

Plex: Specify the size of a box mesh using -dm_plex_box_faces <x,y,z>

Merged in dalcinl/plex-distribute (pull request #1454)

DMPLEX: Speedup DMPlexDistribute[Overlap]()

Approved-by: Matthew Knepley <knepley@gmail.com>

DMPlex: Update Gmsh reader

* Add some utility routines to reduce duplicated code
* Ignore $Comments sections, even before the $MeshFormat section.
Using $Comments sections is an official recommend

DMPlex: Update Gmsh reader

* Add some utility routines to reduce duplicated code
* Ignore $Comments sections, even before the $MeshFormat section.
Using $Comments sections is an official recommendation from Gmsh devs,
now we can support Gmsh meshes exported from Pointwise.

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plex tut ex18: add test 7_hdf5_hierarch

DMPlex: Gmsh: Fix read of PhysicalNames section

* PetscViewerRead() cannot handle quoted strings with embedded spaces

implement comments by Satish

Merged in knepley/feature-expose-section-subdm (pull request #1455)

DM: Expose creation functions for subdm and superdm from a Section

Approved-by: BarryFSmith <bsmith@mcs.anl.gov>

fixes suggested by lawrence

move option freeing, no idea why that fixes a 'free() invalid pointer'

style

:%s/if(/if (/g

DMPlexRewriteSF C only

style in test

style

extend the tests to assert that we have truly improved the balance

rework tests slightly to give platform independent results

refactoring of DMPlexRebalanceSharedPoints. Calculating the new owners of the vertices is now seperated from rewriting the SF

fix strange typo

get the comm in the parmetis error message from dm

refactor the load balance calculation

implemented some suggestions by lawrence on to conform better to style, reduce communication and shorten things