removed extra call to KSPSetFromOptions() on the coarsest level of multigrid
KSP and PC skip displaying other options when preonly and none are selected
fix Chebyshev when using GMRES to estimate eig

removed extra call to KSPSetFromOptions() on the coarsest level of multigrid
KSP and PC skip displaying other options when preonly and none are selected
fix Chebyshev when using GMRES to estimate eigenvalues to skip setting options for PC that is shared with both Cheby and gmres

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PCReset_ML() needs to call PCReset_MG() otherwise outdated MG data structures remain and generate errors

Reported-by: Pratheek Shanthraj <p.shanthraj@mpie.de>

BDDC: Insert needed cast

Merge branch 'stefano_zampini/pcbddcgraph-improved'

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

Merge branch 'stefano_zampini/pcbddc-multilevel-improvement'

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

Merge branch 'stefano_zampini/pcredundant-transpose'

Updated Vince's old Euler solver to work with the latest PETSc.

Merge branch 'karpeev/fix-ksp-pcfieldsplit-submat'

PCGASM: fixed a copy-paste bug.

PCBDDC: bad line removed

PCBDDC: restrict debugging output of pcbddcgraph on edges connected components if verbosity_level == 1

PCBDDC: vertices should be shared by more than 2 subregions if not lying on the global Neumann boundary

PCFieldSplit: options bug fix.

Merge branch 'jed/dmda-memusage'

PCBDDC: move reuse fill after set form options also for Dirichlet and numann solvers

PCBDDC; added support for reuse fill under PCRedudant case for coarse solver

Reuse fill placed after set from options calls

PCBDDC; compute symmetry only once

PCBDDC: wrong out of bounds specification

PCBDDC: added support for reuse fill during coarse matrix factorization

PCBDDC: skip out of bounds indices when importing boundary nodes

updated todo list in bddc.c

PCBDDC: improved management of field split

PCBDDC: two dimensional problem detection should be consistent among processors

PCBDDC; added support for user defined change of basis

fixed ISLocalToGlobalMappingGetInfo() to handle block and non-block cases

PCFieldSplit/Schur: clarification of diag/off-diag Amat options in the docs and manual.