PCBDDC: zero size memory leak

Merge branch 'stefano_zampini/fixes-and-improvements-multilevel'

PCBDDC: VecSetValuesLocal should be guarded when doing multilevel since it checks for valid pointer even if n is zero

Merge branch 'stefano_zampini/fixes-and-improvements-multilevel'

Merge branch 'stefano_zampini/get-rid-of-PCBDDCApplySchur'

PCBDDC; forgot to call destroy on local schur complement

PCBDDC: overlap coarse solver with local substructure correction when possible

PCBDDC: add missing error signal

Parmetis comment removed since the code dynamically adjust to the partiotion obtained

PCBDDC: temporary solution copies can be avoided as well when the rhs does not change

PCBDDC: avoid unneeded copies of rhs during presolve

PCBDDC: need to get the correct type

It could have been changed from options

Merge branch 'stefano_zampini/get-rid-of-PCBDDCApplySchur'

Merge branch 'stefano_zampini/fix-dirichlet-trick'

PCBDDC; get rid of PCBDDCApplySchur/Transpose use MatSchurComplement instead

note: the previous code gave erroneous results for very small local matrices, due to caching issues in the MatMult
inside

PCBDDC; get rid of PCBDDCApplySchur/Transpose use MatSchurComplement instead

note: the previous code gave erroneous results for very small local matrices, due to caching issues in the MatMult
inside PCBDDCApplySchur

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PCBDDC: fixed typo in the code

PCBDDC: PCPostSolve should restore nonzero intial guess flag as it was after PCPreSolve

rhs should be removed either with nonzero initial guess or in presence of dirichlet boundary

PCBDDC; MatGetVecs is now deprecated

Merge branch 'stefano_zampini/pcbddc_deluxe'

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

Merge branch 'stefano_zampini/pcbddc-changeofbasis'

Conflicts:
src/docs/website/documentation/changes/dev.html

PCBDDC: use vecduplicatevecs instead of explicit loop

Merge branch 'barry/docs-matblocksize'

Merge branch 'stefano_zampini/fixes'

PCBDDC: wrong mat type

PCBDDC; worng check for when setting local adjacency graph

MatGetVecs() and KSPGetVecs() replaced with MatCreateVecs() and KSPCreateVecs()
since they are creators not getters