PCBDDC: create sub_schurs just when needed

Merge branch 'master' into tisaac/ts-ex11-amr

* master: (141 commits)
chombo: fix dirname in tarball and update to use snapshot with gcc-6.1 compile fix
petsc4py: fix tarball url [for arbitary c

Merge branch 'master' into tisaac/ts-ex11-amr

* master: (141 commits)
chombo: fix dirname in tarball and update to use snapshot with gcc-6.1 compile fix
petsc4py: fix tarball url [for arbitary commitid] - and dirname in tarball
Plex: Moved ReconstructGradients_Internal() and ApplyLimiter_Internal() to Plex from SNES
CUDA: Added external declaration for cuBLAS handle.
docs: fix reference to KSP_Create in parent commit
Add information on PETSC_EXTERN and PETSC_INTERN to developers manual
Plex: Symbol is shared between DM and SNES, so must be EXTERN
Plex: Remove unused variables
Configure: Fix check for spaces in PETSC_DIR
Plex: Updated examples to new DMPlexCreateBoxMesh()
sick of failure due to incorrect master branch
SNES ex12: Fixed unstructured GMG test
SNES ex12: Added another unstructured GMG test
petsc4py: use the snapshot with the fix for dmplex change
Examples that require Fortran to compile but were listed in tests that did not require Fortran
Plex ex19: Added DMSetFromOptions()
Plex: Store a flag indicating whether the boundary should change during remeshing - Set using -dm_plex_remesh_bd - Changed Remesh_Internal() signature
Always coarsen boundaries.
Plex: Fixed option name
Plex: Protect unused variables
...

Conflicts:
src/dm/impls/plex/makefile
src/snes/utils/dmplexsnes.c

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PCBDDC: fix memory leak

Merge branch 'master' into stefano_zampini/feature-pcbddc-saddlepoint

Conflicts:
src/ksp/pc/impls/bddc/bddc.c
src/ksp/pc/impls/bddc/bddcprivate.c
src/mat/impls/aij/seq/mkl_pardiso/mkl_pardiso.c

Merge branch 'stefano_zampini/fix-bddcnullspace'

PCBDDC: remove PCBDDCSetNullSpace. Nullspace info is now local and should be attached to the local Neumann matrix

PCBDDC; start removing code for bddcnullspace

PCBDDC: Found more efficient way to compute the initial guess in multilevel

Merge branch 'master' into stefano_zampini/feature-pcbddc-saddlepoint

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

PCBDDC: WIP added support for mixed boundary conditions (works for Darcy). Need to check if it works for Stokes.

Multilevel extension does not currently work with mixed BC or a mix of benign and non

PCBDDC: WIP added support for mixed boundary conditions (works for Darcy). Need to check if it works for Stokes.

Multilevel extension does not currently work with mixed BC or a mix of benign and non-benign subdomains. Need to pass the B0 information to coarser levels anyway, because we need to properly compute the no-net-flux condition at coarser levels.

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PCBDDC: use exact BDDC without dirichlet trick when computing the initial guess

PCBDDC: fix for coding convention

PCBDDC: use one application of the coarse preconditioner to compute the non-benign component of the solution

Merge branch 'stefano_zampini/fix-static-analyzer'

a couple of fixes suggested by clang analyzer
add missing error checking
minor formatting fixes

Fixes for issues found with clang static analyzer,
mostly set but unused variables

Time: 1 hour

PCBDDC: fixes from static analyzer nightly build

PCBDDC: fixes for complex builds

PCBDDC: if adaptive selection has not been requested at the coarse level, we need to use zerorows option for deluxe

PCBDDC: optimizations for the multilevel BDDC with benign subspace and CHEBYSHEV coarse solvers

Most of the times, the computation of the benign correction is not needed.
Added benign_have_null, ben

PCBDDC: optimizations for the multilevel BDDC with benign subspace and CHEBYSHEV coarse solvers

Most of the times, the computation of the benign correction is not needed.
Added benign_have_null, benign_need_correction, so that we can decide at command line to not compute the benign correction for Stokes

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PCBDDC: small fixes

Print graph used to compute connected components when needed
solved memory leak

PCBDDC: remove usage of sf_nroots and sf_nleaves members of Mat_IS data structure

fixed a memory leak

PCBDDC: output the global id of the wrongly computed coarse index

PCBDDC: less stringent check on benign trick applicability

PCBDDC: remove faster deluxe switch