PCBDDC: bug fix in inheritance of solver package for seq solver of deluxe

improve the memory usage of PCGAMGCreateGraph()

PCBDDC: deluxe setup should use PCBDDCGetCandidatesIS instead of accessing the graph structure directly

Merge branch 'stefano_zampini/pcbddc-primalfixes' into stefano_zampini/pcbddc_deluxe

PCBDDC: forgot to commit relevant changes to bddcprivate.c and bddcprivate.h

PCBDDC: candidates should be always computed.

they are returned back only if the pointer is not null

PCBDDC: reverted selection of primal vertices as before 1e1f2d9

PCBDDCGraphGetCandidateIS now returns index sets only if the user asks for them

Merge branch 'barry/fix-gamg-preallocation-block'

Added code to properly preallocate "diagonal" portion of scalar matrix derived from vector matrix in PCGAMGCreateGraph()

Reported-by: Fabian Jakub <Fabian.Jakub@physik.uni-muenchen.de>

PCBDDC: special nodes should be selected as primal vertices even if they are shared by two subdomains only

they thus need to be communicated to relevant neighbours when performing graph setup

PCBDDC: deluxe rebuild was broken. Now fixed.

PCBDDC: less restrictive test on parallel errors

PCBDDC: deluxe scaling uses all sequential problems if threshold value is negative

Merge branch 'stefano_zampini/matis_getmpixaij'

BDDC: fix compile warnings

PCBDDC: change of basis matrix now acts on the whole set of degrees of freedom

Computation of the local change of basis is unchanged
Interface for user defined change of basis has been changed accor

PCBDDC: change of basis matrix now acts on the whole set of degrees of freedom

Computation of the local change of basis is unchanged
Interface for user defined change of basis has been changed accordingly
A MatShell object is now created for matrix vector multiplications inside the KSP object

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Merge branch 'stefano_zampini/pcbddc-maint' into stefano_zampini/pcbddc_deluxe

PCBDDC: seq_ksp inherits solver package from dirichlet solver

PCBDDC: PetscStrncpy needs an extra +1 now (see ff32304)

PCBDDC: use PetscObjectGetComm instead of PetscObjectComm

PCBDDC: bug fix

PCBDDC: PetscStrncpy now need an extra +1 (see ff32304)

Removed // comments

PCBDDC: added implementation of deluxe scaling

MATIS: MatISGetMPIXAIJ is now well tested and can be public. Moved to MATIS source

minor corrections to matis.c

MATIS: added preallocation when local matrices are not dense

matrix type argument removed