Merge branch 'mesgarnejad/feature-plex-globaltonatural'

* mesgarnejad/feature-plex-globaltonatural:
Plex ex15: This requires HDF5
Plex ex15: Fixed variable type
Plex: Fixed variable init
Ple

Merge branch 'mesgarnejad/feature-plex-globaltonatural'

* mesgarnejad/feature-plex-globaltonatural:
Plex ex15: This requires HDF5
Plex ex15: Fixed variable type
Plex: Fixed variable init
Plex ex15: Added test for reading and writing HDF5 in native format
Vec: Straighten out defines for VECOP
DM: Reminder to handle g2n in DMCreateSubDM()
Plex ex15: One test of g2n working
Plex: Fixed global to natural mapping creation
Plex: When creating g2n map, must use parallel DM
PetscSF: Corrected bug in PetscSFCreateInverseSF() for sparse leaves - Have to index over entire leaf space
PetscSection: PetscSectionCreateGlobalSection() now allows the user to keep local offsets - This is useful is all you want is to filter out the constrained points
Plex: Create the global to natural mapping during distribution if the flag is set
Plex: Added viewing in native format using the global to natural mapping
Plex: Added global to natural ordering support - The natural ordering is the one you have before distribution - Added DMPlexCreateGlobalToNaturalSF() - Added DMPlexGlobalToNaturalBegin/End() - Added DMPlexNaturaToGloballBegin/End()
SF: Added PetscSFCreateEmbeddedLeafSF() - This name sucks, but it subsets on leaves instead of roots
DM: Added an SF for the global to local mapping and a flag to enable its construction - Added DMGet/SetUseNatural() - Should hook this up to DMDA
SF: Added Fortran binding for SFView()
DM: Automatic Fortran binding should work for DMCreateSubDM()
SF: Added PetscSFCompose()
SF: Added PetscSFCreateFromZero()

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SF: Added Fortran binding for SFView()