Allow autoCopy() for blocks of VariableBlockVector

Lasse Hinrichsen-Bischoffrequested to merge
lasse.hinrichsen/dune-istl:feature/autocopy-blockvectorwindow into master

Closes #49 (closed).

This implements two things:

  1. Converting a BlockVectorWindow into an independent BlockVector
  2. as an application of 1., allow autoCopy() to be used for the blocks of a VariableBlockVector

The latter is demonstrated in the vbvectortest.

Edited by Jö Fahlke

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