Mat: add tolerance argument to MatFindNonZeroRowsOrCols_Basic

MatIS: added implementation for PtAP operation

supported P are {Seq|MPI}(B)AIJ and HYPRE
Interface for {MPI|Seq}BAIJ and HYPRE code works, however:
- local PtAP ops are missing for BAIJ
- MatCreateS

MatIS: added implementation for PtAP operation

supported P are {Seq|MPI}(B)AIJ and HYPRE
Interface for {MPI|Seq}BAIJ and HYPRE code works, however:
- local PtAP ops are missing for BAIJ
- MatCreateSubMatr* ops are missing for HYPRE (will be added in a separate branch)

If requested, carry over the l2l representation of P by attaching it to the resulting mat
This is needed by the MFEM constructor for BDDC

added few more tests to ex23.c
L2L storage is disabled because of a bug in MatDestroySubMatrices that will be fixed in a separate branch

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MatIS: use default destroy routine for arrays

Man pages: add newlines after "Notes:"

This allows for proper formatting from sowing.

On OS X (using gsed, not the default BSD sed), from the PETSc root directory:

find src include -type f \(

Man pages: add newlines after "Notes:"

This allows for proper formatting from sowing.

On OS X (using gsed, not the default BSD sed), from the PETSc root directory:

find src include -type f \( -name "*.c" -or -name "*.h" -or -name "*.cxx" \) | xargs gsed -i 's/Notes\s*:\s*\(\w.*\)/Notes:\n \1/'

This adds a newline and 4 spaces whenever "Notes:" is followed by any "word" character, in any .c, .h, or .cxx file in src/ or include/

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MATIS: check if the mappings are the equivalent for square matrices

DOLFIN passes two different objects as l2g maps

MATIS: implement basic block sizes propagation with MatCreateSubMatrix

MatIS: should call MatSetValuesBlocked on the local matrix

Merge remote-tracking branch 'origin/maint'

MatIS: fix MatShift_IS

MATIS: remove ugly usesetlocal

MatSetValuesLocal_IS now takes care of the local l2gmap if present