Merge branch 'barry/petscoptions-object' into stefano_zampini/feature-pardiso-schur

Merge branch 'master' into barry/petscoptions-object

PCBDDC: multilevel fix.

The number on nonzeros per row of B_0 could be large at coarser levels.

PCBDDC: fixes for multilevel cases

MatDetectDisconnectedSubdomains should return if the matrix is empty
Switch to KSPDestroy instead of destroying the pc (this will be fixed once BDDC will have its

PCBDDC: fixes for multilevel cases

MatDetectDisconnectedSubdomains should return if the matrix is empty
Switch to KSPDestroy instead of destroying the pc (this will be fixed once BDDC will have its own reset method)

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PCBDDC: remove unneeded code for disconnected subdomains detection in PCBDDCAnalyzeInterface

corrected code for PCBDDCBenignCheck
NullSpace propogation disabled: all this nullspace thing is fragile

PCBDDC: remove unneeded code for disconnected subdomains detection in PCBDDCAnalyzeInterface

corrected code for PCBDDCBenignCheck
NullSpace propogation disabled: all this nullspace thing is fragile at the moment, need to be rethought

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PCBDDC: added missing check for pressure dofs

PCBDDC: remove explicit references to mumps in the source code

PCBDDC: remove matmatmult operation, and exploit knowledge of pressure change of basis

Merge remote-tracking branch 'origin/hzhang/matmatmult_dense'

PCBDDC: complete optimization of benign subspace trick

There's no longer need of PtAP operations on local matrices

Complete update to new PetscOptions interface

Begin renaming the PetscOptions objects for the future where PetscOptions will not be a singleton

PCBDDC: added LDL^T factor workaround for change of basis on pressures

when changing the basis on the pressures, the local problems loose sparsity, and the nonzero entries in the LDL^T factors grow

PCBDDC: added LDL^T factor workaround for change of basis on pressures

when changing the basis on the pressures, the local problems loose sparsity, and the nonzero entries in the LDL^T factors grow like n^2 or greater

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add MAT_INPLACE_MATRIX; replace MAT_REUSE_MATRIX with it for MatConvert()

Merge branch 'master' into stefano_zampini/feature-pardiso-schur

Branch got out of sync with master

PCBDDC: destroy new_global_mat if not using the change of basis (reuse fix)

PCBDDC: corrected logic around change of basis and benign trick

in case the benign trick has been requested, the local matrices are always swapped, instead of swapping the global matrix

Introduce MPIU_Allreduce() to detect cases where all processes that share an MPI comm do not call the same sequence of MPI_Allreduce()
This is a bug that can be difficult to track down.

Suggested-by

Introduce MPIU_Allreduce() to detect cases where all processes that share an MPI comm do not call the same sequence of MPI_Allreduce()
This is a bug that can be difficult to track down.

Suggested-by: Eric Chamberland <Eric.Chamberland@giref.ulaval.ca>
Suggested-by: Patrick Lacasse <placasse@giref.ulaval.ca>

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fix violations of PETSc style guide: Usage of SETERRQ and NULL