[petsc-dev] API changes in MatIS

[Stefano Zampini]

> This is to do recursive BDDC or what?
>
>
Yes. When creating the BDDC coarse matrix, now the code has three 3 options

A) coarse matrix is a MATIS -> multilevel BDDC
B) coarse matrix is SEQAIJ -> one level BDDC with only one proc (or all)
solving directly the coarse problem
C) coarse matrix is MPIAIJ -> one level  BDDC with a parallel direct solve

I think that PCREDUNDANT can do the job in both cases of options B if the
matrix would be parallel.
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