[petsc-dev] MatGetLocalSubMatrix, MatLocalReference implementation

[Jed Brown]

In this direction, I need to be able to handle the off-diagonal local parts,
which implies logically distinct row mappings and column mappings.  It seems
like it should have been that way all along and I will make it so (tomorrow)
unless there are objections.  This implies two parameters in
MatSetLocalToGlobalMapping, but I think that is the only API change.

Jed
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