PCBDDC: optimize for reusage of Schur solver (if any)

R_to_B and (optionally) R_to_D scatters are different
reusage is not possible when change of basis has been requested

Infrastructure that allows failures in PCSetUp(), PCApply(), MatMult() etc due to, for example a zero pivot or function evaluation outside its domain, to propagate up and become a KSP_DIVERGED inste

Infrastructure that allows failures in PCSetUp(), PCApply(), MatMult() etc due to, for example a zero pivot or function evaluation outside its domain, to propagate up and become a KSP_DIVERGED instead of generating an error that stops the program. In response to Issue 96. This includes failures in MatCreateSNESMF() applications due to domain errors. The mechanism to propagate some errors is by setting Info or Nan into the output vector and using the norm or inner product reductions in SNES or KSP to propagate the error condition to all processes and then handling them immediately after the norm or inner product.

This allows, for example, ODE integrators to try again with a smaller time-step if the PCSetUp failed instead of requiring a complete restart of the run with other options.

Currently some error conditions, such as function domain error in a line search may not get progated up using the correct SNESConvergedReason

See src/snes/examples/tests/ex69.c for the handling of several conditions

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PCBDDC: reuse as much as possible the MUMPS Schur solver

optimizations still need to be applied

PCBDDC: bugfixes

- change of basis falg should be set for each cc (not primal constraint)
- work should be set to zero when importing boundary values of A_RRmA_RV to avoid undefined values
- A_VV sh

PCBDDC: bugfixes

- change of basis falg should be set for each cc (not primal constraint)
- work should be set to zero when importing boundary values of A_RRmA_RV to avoid undefined values
- A_VV should be converted to BAIJ when working with SeqBAIJ

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PCBDDC: reduce memory footprint of BDDC application

The previous code was designed without adaptivity in the picture
pcbddc->local_auxmat1/2 should act on boundary dofs only
except when the static s

PCBDDC: reduce memory footprint of BDDC application

The previous code was designed without adaptivity in the picture
pcbddc->local_auxmat1/2 should act on boundary dofs only
except when the static switch has been selected: in this case pcbddc->local_auxmat2 should act on the whole set of R dofs

tested on linear spd systems and with NKS with bs 3

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PCBDDC: scale a smaller matrix

PCBDDC: Implement caching strategy for dirichlet dofs in graph

PCBDDC: remove is_I_layer from sub_schurs data structure

PCBDDC; improved numbering of coarse dofs when many constraints are presents per connected component

PCBDDC: merge together two loops

PCBDDC: rewrite code for constraints setup

the code is now simpler and more general. It will also allow to renumber coarse dofs clustering them together with respect to connected components

PCBDDC: remove unneeded variables from pcbddc data structure

PCBDDC: nullspace adaptation of change of basis enabled only in debug mode

PCBDDC: aux_primal_numbering is no longer needed

PCBDDC: remove unneeded code

PCBDDC: get rid of no longer needed sorts

PCBDDC: get rid of PCBDDCGetPrimalVerticesLocalIdxs and PCBDDCGetPrimalConstraintsLocalIdxs

these functions are no longer needed

PCBDDC: wrong free

PCBDDC: fixes for preconditioner reuse

PCBDDC: sorting of connected components is performed only when it is really needed

PCBDDC: reduce memory footprint of PCBDDCGraph

PCBDDC; another multilevel bugfix

it could happen that we have a subdomain completely disconnected from the others (with pcis->n_B = 0)
the adjacency list computed will be empty

PCBDDC: bugfix for multileveling

when ncc = 0, subsets[0] is 0x0 and the second malloc fail

PCBDDC: remove GlobalToLocal mappings from graph code

interface consistency routines greatly simplified

PCBDDC: create workspace objects for checking consistent informations only when needed