PCBDDC: get rid of parallel application of deluxe scaling

code has been greatly simplified
introduced subcommunicators in PCBDDCSubSchursSetUp to improve performances in multilevel cases
adaptivity

PCBDDC: get rid of parallel application of deluxe scaling

code has been greatly simplified
introduced subcommunicators in PCBDDCSubSchursSetUp to improve performances in multilevel cases
adaptivity is supported only in combination with deluxe scaling

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Merge branch 'master' into jed/chem
Note merging a branch with good stuff in it for a year and a half is insane!

Conflicts:
src/ts/examples/tutorials/makefile
src/ts/interface/ts.c

Merge branch 'master' into stefano_zampini/pcbddc-adaptive-selection

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

Merge branch 'master' into barry/saws-options-merge-master

Totally confusing manual merge, could be wrong

Conflicts:
include/petscoptions.h
src/dm/impls/da/dacreate.c
src/sys/objects/aoptions.c

Merge branch 'master' into barry/saws-options-merge-master

Totally confusing manual merge, could be wrong

Conflicts:
include/petscoptions.h
src/dm/impls/da/dacreate.c
src/sys/objects/aoptions.c
src/sys/threadcomm/interface/threadcomm.c

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Merge branch 'master' into pr252/dmay/PetscViewerBinarySkipHeaderVecViewLoad
Manual merge of makefile

Conflicts:
src/sys/classes/viewer/examples/tutorials/makefile

Merge branch 'barry/refactor-petscsubcomm'

PCBDDC: fixes bugs

- dirichlet dofs should be computed since the PCBDDCGraph code allows to specify nonn-consistent sets among neighbours
- add dirichlet dofs to the list of simpli scalied dofs in d

PCBDDC: fixes bugs

- dirichlet dofs should be computed since the PCBDDCGraph code allows to specify nonn-consistent sets among neighbours
- add dirichlet dofs to the list of simpli scalied dofs in deluxe
- fix number of constraints computed during adaptive selection

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minor cleanup of PetscSubcomm code and documentation

PCBDDC; prepare for upcoming VecLockPush/Pop

PCBDDC: add slot for vertices in sub_schurs data structure.

This will also be helpful for adaptive selection

PCBDDC; clean up of sub_schurs/deluxe code

* options database are now part of sub_schurs setup
* eliminated unneeded field from sub_schurs structure
* added 2 interface functions to init and setup s

PCBDDC; clean up of sub_schurs/deluxe code

* options database are now part of sub_schurs setup
* eliminated unneeded field from sub_schurs structure
* added 2 interface functions to init and setup sub_schurs when setupping the preconditioner
* if a change of basis is requested, releveant matrices are projected
* still need to be tested when the BDDC is reused

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PCBDDC: added initial support for computation of Stildas

the computation is very intensive, need to find an alternative

PCBDDC: removed old SubSchursSetUp code

PCBDDC: added support for explicit computation of Schur complements using MUMPS in sub_schurs code

PCBDDC: store principal minors of local Schur complements by columns

This shoudl facilitate the computation of adaptive constraints

PCBDDC: remove unneeeded index sets

PCBDDC: small fixes

PCBDDC: move computation of explicit schur complements from deluxe code to sub_schurs setup

PCBDDC: make deluxe->seq_mat and sum of schur complements members of sub_schurs

PCBDDC; remove unneeded copies

PCBDDC: use MatISGetMPIXAIJ to compute sum of schur complements

PCBDDC: added a slot for local neumann matrix in sub_schurs (for future use of MUMPS)

solved a bug with external packages and 0 sized seq_ksp

PCBDDC: added a second sub_schurs structure to pcbddc data structure

Begin reorganization of SubSchurs code for code reuse for adaptive selection of constraints

PCIS: added reusability of PCISSetUp

PCBDDC: make sub_schurs a member of PC_BDDC data structure