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

PCGASM now works correctly, tested with SuperLU_dist on multirank subdomains.

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

Merge branch 'stefano_zampini/hypre-ads'

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

PCBDDC: add missing consistency check for fields

PCBDDC: avoid unneeded computations for custom primal vertices (if any)