PCNNCreateCoarseMatrix: fix allocation error

Estimate the number of off-diagonal nonzeros using the number of local
neighbors, but be permissive because this is not sufficient in general.
Exact prea

PCNNCreateCoarseMatrix: fix allocation error

Estimate the number of off-diagonal nonzeros using the number of local
neighbors, but be permissive because this is not sufficient in general.
Exact preallocation would require the connectivity graph for subdomains,
but is not critical for PCNN performance.

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PCIS: consider myself as a neighbor when classifying interface nodes

Local periodic nodes should be considered has interface nodes.

PCBDDC: More robust method to compute local boundary nodes

Using counter vector to infer local boundary nodes is wrong in case a
subdomain has local periodicity.

PCIS: Use PETSC_COMM_SELF instead of MPI_COMM_SELF

removed string version of function name for XXXRegister(), PetscFunctionListAdd() and PetscObjectComposeFunction()

Change all PETSC_EXTERN_C to PETSC_EXTERN

Hg-commit: 8d2ebbb193fb583bccc64015e35640c4e08c3426

merge, terrible manual process with many conflicts with Jed's PETSC_INTERNAL

Hg-commit: 84df07d03c6e55bd0f27bd5ee8c1738562bd529d

visibility: use PETSC_INTERN when possible

Hg-commit: 3b4bfb5c23843293f1f08790b48437080a32eb42

completed removing unneeded EXTERN_C_BEGIN/END from Mat directories and converting to PETSC_EXTERN_C for constructors
tested with and without dynamic with and without C++

Hg-commit: 7d27d7f4d9ea3bfe

completed removing unneeded EXTERN_C_BEGIN/END from Mat directories and converting to PETSC_EXTERN_C for constructors
tested with and without dynamic with and without C++

Hg-commit: 7d27d7f4d9ea3bfe6616fafdfb32d046b5db53a1

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began removing unneeded EXTERN_C_BEGIN/END and converting needed ones to PETSC_EXTERN_C

Hg-commit: e0c157606a3283d5a4ba8902a0da5cad0e2aa531

changed use of PetscObjectComposeFunctionDynamic() to PetscObjectComposeFunction() to allow use of static for functions for standard use in PETSc
PetscObjectComposeFunctionDynamic() is still availabl

changed use of PetscObjectComposeFunctionDynamic() to PetscObjectComposeFunction() to allow use of static for functions for standard use in PETSc
PetscObjectComposeFunctionDynamic() is still available for use if needed
also fixed calls to PetscObjectComposeFunction() to not wrap lines (per PETSc coding style)

Hg-commit: 822f9ddaac95a8ff6c2a9ad77fbf07d02d2c20d9

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

Hg-commit: 3da37c458124ad48ae939f4e9823e4430ee0b8be