PCBDDC: added support for the benign trick in PCBDDCSubSchurs

The setup code of SubSchurs need to be expanded to symmetric indefinite factorizations support from MUMPS

PCBDDC: need to change iteration matrix in case the benign trick has been requested

PCBDDC: added function to Pop or Push B0 from local mat

PCBDDC: handle change of basis on local pressures

B0 is extracted from the local matrices before setup. Still needs to be added back when setup is done.

Replaced PetscViewerASCIISynchronizedAllow() with PetscViewerASCIIPushSynchronized() PetscViewerASCIIPopSynchronized()

PCBDDC: compute column sum of zero block

PCBDDC: add command line switch for detecting saddle point

PCBDDC: fix set-but-not-used warning from nightly build

PCBDDC: raise an error if the preconditioning matrix is not square

MATIS: enable rectangular shape for MATIS

MATIS: remove mapping member of MATIS. Use layout mappings instead

PCBDDC: fixes when reusing the preconditioner with adaptive selection

PCBDDC: fix typos in the specification of MPI operation

Merge branch 'stefano_zampini/pcbddc-adaptive-selection'

PCBDDC: update call to PCBDDCNullSpaceAssembleCorrection

disable propagation of null space to coarse levels since it is untested

PCBDDC: forgot to add the header file

PCBDDC: Fix for nullspace

the nullspace branch was not tested. This fixes a bug

Merge branch 'stefano_zampini/pcbddc-adaptive-selection'

Conflicts:
src/ksp/pc/impls/bddc/bddcprivate.c
src/ksp/pc/impls/bddc/bddcscalingbasic.c

PCBDDC: better to use size_active_schur as a guard

PCBDDC: solve some errors in subschurs appearing when not restricting the work on active processes

PCBDDC: workaround when reusing the coarse solver with different sizes

With constraints adaptivity in place, it could happen that coarse problems generated in successive calls can have different siz

PCBDDC: workaround when reusing the coarse solver with different sizes

With constraints adaptivity in place, it could happen that coarse problems generated in successive calls can have different sizes
Since PCBDCD does not have a reset method so far, lets destroy the object.

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PCBDDC: updated man pages

PCBDDC: solve compilation error in nightly builds

PCBDDC: fix for complexes from nightly builds

PCBDDC: remove holes in the set of ranks of new processors