MatFeti

[Dmitry Karpeev]

I've found something that looks like somewhat outdated code (e.g., it uses
SLESxxx) for FETI-DP:
src/mat/impls/feti

It appears that this matrix class actually implements a FETI-DP based
preconditioner.
Is that right?
Perhaps some (or all) of it can be rolled into a more general
PCFieldSplit-type framework?
Any ideas?

Thanks.
Dmitry.
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