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Overlapping Additive Schwarz on Nonoverlapping Grids

Peter Bastian requested to merge ovlp_on_nonovlp into master

This branch adds an overlapping additive Schwarz preconditioner implemented in a purely algebraic way on nonoverlapping grids by

  1. starting from an indexset with minimal overlap, construct an index set with more overlap (is based on the ParallelIndexSet class from dune-common)
  2. Construct a matrix on the new overlapping index set from a matrix on the minimal overlap index set
  3. Implement a two-level Schwarz preconditioner using the Nicolaides coarse space This means you can have overlapping Schwarz with arbitrary overlap on UGGrid and ALUGrid.

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