Split out petscdmdatypes.h and petscdmtypes.h

Hg-commit: 3f8f2ebaa036547d616a74a818868b81d0922c1f

put in a few more PetscObjectComm() I missed before due to not general enough regexp
who the hell puts a w in front of comm for no reason

Hg-commit: 7bcda6053dee43d0c90c32cc693ca5bf2fdf4c99

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

Hg-commit: 3da37c458124ad48ae939f4e9823e4430ee0b8be

Add VecGetLayout() and remove some needless dependencies on vecimpl.h

Hg-commit: 0d0721e64fa8861a4e7168e2a936ca714ebeebcb

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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removed stupid abbreviation in SNESLogConvHistory() and convert to C function

Hg-commit: aa80f1fe93c28cb23676c77dffe7050622f79cb4

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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Uncrustified src/snes/*

Hg-commit: 0b89af55379cc95040ca47c4c1f8000d6a978df2

Fixed missing closing curly brace in src/snes/impls/vi/vi.c

Hg-commit: 58cc6199509f1642f637843f1ca468283bf5ced9

Uncrustified parts of src/snes/*

Hg-commit: c338118f302c917361be863cb61bfa992de8f769

Reformatted: "Do not put a blank line immediately before PetscFunctionReturn;"

Hg-commit: c8a41c455986e732d0ea0513d7162a54daffaece

Reformatted: "There should be a blank line before PetscFunctionBegin;"

Hg-commit: 05bda4416aaceb2dbd9d85b5720629adc88eef98

Updated style to obey 'Do not put a blank line immediately after PetscFunctionBegin;'

Hg-commit: 5408b9ce2402ad624305b7a7a323ab3ae5e0c3f1

Reformatting: 'No space after a '(' or before a ')''

Hg-commit: 797341a7bfba18bb97e6da668b36bad2e5977356