converted in a bunch more PetscObjectComm() that I missed before

Hg-commit: a2a4fef7cd143b546baa5d5374a47a4ad76dd2d6

moved non-Vec portions of PetscSection to vec/is subpackage

Hg-commit: 9e3e9ff2b4d00a78c47133c617a9f7e4efa62be9

added PetscObjectComm() and used it to replace (((PetscObject)obj)->comm)

Hg-commit: 3da37c458124ad48ae939f4e9823e4430ee0b8be

Make petscimpl.h private

Hg-commit: 910e8b03a54a915953944da6f75eb81c807d7428

petscvec.h no longer includes petsc-private/vecimpl.h

This makes dependence on Vec internals more explicit. Almost all
impacted dependencies fall in two categories:

* reference to vec->map: could b

petscvec.h no longer includes petsc-private/vecimpl.h

This makes dependence on Vec internals more explicit. Almost all
impacted dependencies fall in two categories:

* reference to vec->map: could be eliminated by adding VecGetLayout(),
which is probably a good idea anyway.

* dependence on VecScatter_MPI_General: this is low-level anyway, so I
don't think there is much to gain by abstraction.

Hg-commit: 612ef938483b9f0137f3e95bc1d14775547d74f1

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DMLabel: Added simple index test

Hg-commit: 4089a612279e57103dc20ab430fb6fc2456681ef

DMLabel: Added ability to use a bit index
- Needs a point interval [pStart, pEnd)
- Added DMLabelCreate/DestroyIndex() and DMLabelHasPoint()
- Other function update the index information

Hg-commit:

DMLabel: Added ability to use a bit index
- Needs a point interval [pStart, pEnd)
- Added DMLabelCreate/DestroyIndex() and DMLabelHasPoint()
- Other function update the index information

Hg-commit: 6475a3810725e1e8df19fcfe5d01fa43b08115c5

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removed PETSC_NULL from C and Fortran (except declaration in C for backward compatibility). Kept PETSC_NULL_xxx for Fortran
Fixed a few bugs where PETSC_NULL had been used incorrectly.

Hg-commit: 05

removed PETSC_NULL from C and Fortran (except declaration in C for backward compatibility). Kept PETSC_NULL_xxx for Fortran
Fixed a few bugs where PETSC_NULL had been used incorrectly.

Hg-commit: 054705a517d7f4388a8a084415d7478cbe95dff4

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DMPlex: Updated test output
- Changed LaTeX output format
- SF types changed
- Fixed bug in inner refinement cell orientation

Hg-commit: 0046588b7dac3a4065e7bb667c09b1b8835ef0da

DMPlex: Fix bugs in refactor of uninterpolated submesh construction
- Cells are always depth 2 in the submesh
- subverted number did not have correct offset
- Restore was too early

Hg-commit: 8fbefe

DMPlex: Fix bugs in refactor of uninterpolated submesh construction
- Cells are always depth 2 in the submesh
- subverted number did not have correct offset
- Restore was too early

Hg-commit: 8fbefea4efdbd6aba214e8e63d3d5798edbda258

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DMPlex: Handle missing elements of subpointMap
- These are hacks to support currently broken PyLith behavior

Hg-commit: 0cfcc9013b20fb57cf3a701b6e5edc8cde240ff7

DMPlex: Fixed DMPlexLabelRemove()
- If its the first one, change the root

Hg-commit: 5661d69c942135292b2f00bc7ae4207a8ebd13ed

DMPlex: Refactor of submesh operation
- First mark submesh, then extract it
- This should allow us to mark separately once cohesive cells are made

Hg-commit: 2a90d0ebca96a67885cd1df39b1876e6077337e2

DMPlex: Added DMPlexCreateSubpointIS(), fixed bug in DMPlexMatSetClosure(), moved submesh ops to a file
- Use subpointIS where we used old subpointMap which is now a DMLabel
- Bug was a failure to up

DMPlex: Added DMPlexCreateSubpointIS(), fixed bug in DMPlexMatSetClosure(), moved submesh ops to a file
- Use subpointIS where we used old subpointMap which is now a DMLabel
- Bug was a failure to update the index offset correctly in the case with no fields in the section
- Moved all submesh operations to plexsubmesh.c

Hg-commit: 8163c5abcc24b59cbb866a576cd085c13542a9b1

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Removed remaining spaces in cast to pointer-type.

Hg-commit: dccb79187adf08b4501155bd6550e95ac2ab554c

DMPlex: Fix variable initialization
- This happens when the submesh is empty on a process

Hg-commit: 2ccc7ff4e0471a48a660a80ec2eed85328333712

DMPlex: Fixup VTK subpoint mapping

Hg-commit: 3ce3f722a57cd42c6fd732ef8378c769cce6726c

DMPlex: Cohesive tests now use DMPlexCreateSubmesh() to make the fault from vertices

Hg-commit: 62298c967ab2019618368806cc714f57a5b395f1

DMLabel: Added DMLabelDuplicate() and protect DMLabelDestroy() for PETSC_NULL

Hg-commit: e6cfe7af3f2bdf82f45054ed1fe543cbe2d61f2f

DMPlex: Submesh creation appears to work for interpolated meshes
- The subpointMap is now a label
- Reworked submesh creation to avoid explicit dimension use

Hg-commit: cf30b86010bd419fea274ceed86d9

DMPlex: Submesh creation appears to work for interpolated meshes
- The subpointMap is now a label
- Reworked submesh creation to avoid explicit dimension use

Hg-commit: cf30b86010bd419fea274ceed86d92b12e5f4324

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DMPlexShiftCoordinates_Private: close memory leak

Hg-commit: 2f3734bedc2dade526c09f6b0348515e6a420442

DMPlex: Guard submesh work until it is complete

Hg-commit: 3365fad7b6ef970897dc544b47d709fd512a07b2

Uncrustified src/dm/*. No re-uncrustification of un-uncrustified plex.c.

Hg-commit: 0eadce41498eb88aa85fb46f989ad9d09bfd9c3e

DM+DMPlex: Fixing the automatic detection of block size

Hg-commit: edd41d416ac911b98e2f35932bfb5f07828b7549

DMPlex: Removed some dead code

Hg-commit: 59d815b33b0c2a14285a9bc1654f3cbb308e44bf