[Dune] [#374] inconsistent typedefs for IndexSets in Grid and GridPart

[Dune]

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FS#374 - inconsistent typedefs for IndexSets in Grid and GridPart
User who did this - Andreas Dedner (dedner)

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Well Christian,

1) yes, the GridView is going to be based on, but not be identical to,
   the GridParts. So as I understand it there are going to be no
   GridParts in dune-grid but only the two GridViews (leaf/level)
   accessible through the grid itself. So we are happy to move the
   GridParts including all the Wrappers to dune-fem.
2) the difficulties for us to add things to the dune-grid interface
   have always been rather high. 
   The GridPars have been moved back and
   forth between dune-grid and dune-fem quit a bit - Robert wanting to
   have them in dune-fem and myself wanting to have them in dune-grid;
   I found the idea of having a view class rather nice especially after
   the introduction of two intersection iterators. Since views are now
   to be added to the grid, the GridParts are redundant in dune-grrid.
3) We need the extended IndexSet in the GridPart since we obtain all
   relevant grid information through the GridParts in dune-fem - including
   the IndexSet. We could and perhaps should have wrapped the Leaf/Level
   GridPart instead of the IndexSet - but a lot of the GridPart stuff
   is very old and as I said the discussions in Freiburg of whether to move
   the GridParts to dune-fem or dune-grrid is almost as old.
 
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