PCBDDC: default values should be set during creation

PCBDDC: added benign correction during presolve and check on the BDDC operator

still does not work, need to understand what is missing

there is some extra code that should be removed from PCBDDCMat

PCBDDC: added benign correction during presolve and check on the BDDC operator

still does not work, need to understand what is missing

there is some extra code that should be removed from PCBDDCMatMult_Private

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PCBDDC: MUMPS Cholesky solver could be used for symmetric matrices

This has also the advantage that POTRF/S/I will be called inside BDDC
SYTR/S/I will be called inside MUMPS (can I fix this?)

PCBDDC: remove zerodiag from bddc data structure

PCBDDC: forget to protect line by n_benign guard

PCBDDC: fix error in coarse submatrix computation for the benign trick

debug code now is properly working

Merge branch 'pr353/dmeiser/fix-ex2_bjacobi-update/master'

Merge branch 'pr349/mapdes/extend_hypre_boomeramg_interface/master'

PCSemiRedundant:
* Updated the viewer to be compatible with the refactoring of PetscViewerGetSubcomm() introduced by Barry in the branch barry/fix-petscviewer-attempt-2

Merging with Barry's refactor of PetscViewerGetSubComm

Merge branch 'barry/fix-petscviewer-attempt-2' into dmay/pcsemiredundant

PCBDDC: forgot to destroy objects

PCBDDC: added mechanism to pass p0 from residual vector to coarse space

still does not work completely
need to add more checks

PCBDDC: move change of basis on pressure during PreSolve

Added check for b(v_I,p_0) = 0 for all v_I (o on Gamma and \partial\Omega)

for -pc_fieldsplit_detect_coupling option apply complete matrix preconditioner first so that
computation of Afield[1] with MatGetSubMatrix() requests only a few rows and all columns, thus is far more

for -pc_fieldsplit_detect_coupling option apply complete matrix preconditioner first so that
computation of Afield[1] with MatGetSubMatrix() requests only a few rows and all columns, thus is far more
efficient then previous code that requests all rows and only a few columns()

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PCBDDC: extend computation of coarse basis functions and coarse matrix for the benign trick

debug output temporary suppressed,
the code is still not working.
- GMRES with BDDC setup and dummy applic

PCBDDC: extend computation of coarse basis functions and coarse matrix for the benign trick

debug output temporary suppressed,
the code is still not working.
- GMRES with BDDC setup and dummy application (PCApply as VecCopy) does not converge
- still need to extract p0 from residual

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PCBDDC: forgot to set columns values

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

fixed error from ==0 to ! conv.

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.

Changed to use MatIncreaseOverlapSplit

fixed makefile and updated gamg tests

removed old code

change file name to match common naming conv.