PCBDDC: coarse_mat is no longer a member of bddc private struct.

Merge remote-tracking branch 'origin/master' into stefano_zampini/pcbddc-improvelocalsolvers

Merge remote-tracking branch 'origin/master' into stefano_zampini/pcbddc-mirrorsfix

Merge remote-tracking branch 'origin/master' into stefano_zampini/pcbddc-constraintssetupimproved

Merge branch 'stefano_zampini/pcbddc-orthonormalroutine'

* stefano_zampini/pcbddc-orthonormalroutine:
PCBDDC: Added orthonormalization routine

PCBDDC: Added orthonormalization routine

nullspace code changed accordingly

Merged petsc/petsc into rmills/petsc master.

Merge branch 'stefano_zampini/pcbddc-development'

Conflict with 'jed/matnullspaceremove-inplace', resolved using:

$ git merge -X theirs --no-commit stefano_zampini/pcbddc-development
$ git grep

Merge branch 'stefano_zampini/pcbddc-development'

Conflict with 'jed/matnullspaceremove-inplace', resolved using:

$ git merge -X theirs --no-commit stefano_zampini/pcbddc-development
$ git grep -l MatNullSpaceRemove src/ksp | xargs perl -pi -e 's@(MatNullSpaceRemove\([^,]+,[^,]+),NULL\)@$1)@'
$ git commit -a

* stefano_zampini/pcbddc-development:
PCBDDC: add wrappers for PetscStackCallBLAS
PCBDDC: Final fix for locally periodic problems
PCNNCreateCoarseMatrix: fix allocation error
PCIS: consider myself as a neighbor when classifying interface nodes
PCBDDC: Remove misuses of neighbours_set in FETI-DP code
PCBDDC: Coarse solution lives in the span of phi (not psi)
MATIS: Add IsSymmetric and IsHermitian implementations
PCBDDC: More robust method to compute local boundary nodes
PCBDDC: Add partial support for periodic problems replacing Sort with RemoveDups
PCBDDC: Add support for non-symmetric linear systems
PCBDDC: Stiffness scaling should be rebuilt in any case (just to be safe)
PCBDDC: Remove trailing blanks
PCBDDC: Consistency of CSR graph passed in postponed to PCSetUp
PCBDDC: Preliminary work to split PCBDDCCoarseSetUp in simpler pieces
PCBDDC: allow compilation without metis header
PCBDDC: Optimal allocation in PCBDDCGetPrinalVerticesLocalIdx
PCBDDC: add verbosity level to graph view
PCBDDC: change boolean debug flag to integer -pc_bddc_check_level
PCBDDC: Workaround for BAIJ local matrices: convert to AIJ for coarse matrix
PCIS: Use PETSC_COMM_SELF instead of MPI_COMM_SELF
PCBDDC: many changes
ISG2LMapApply: fix __FUNCT__ and invalid access before globals are set up

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PCBDDC: Remove trailing blanks

PCBDDC: change boolean debug flag to integer -pc_bddc_check_level

Distribution of local primal indices requires level > 1.

PCBDDC: many changes

- Source code split
- Added Reset procedures
- Support for different MatStructure flags