[Dune] [#848] add index method to GeometryType

[Dune]

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FS#848 - add index method to GeometryType
User who did this - Andreas Dedner (dedner)

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I forgot to answer this:

interesting how ideas can differ. I was thinking of a consecutive index
per dimension (which is basically the topologyId>>1 + 2^dim for none).
I had never though of a "global index", meaning unique over all dimensions as
Joe suggested...
Perhaps provide both index methods? 
Or provide one and the necessary utility to get the other like Joe suggested
either on class (static) or helper class? These utility are of course easy to
obtain for both versions of index...

Both approaches give the same so it seems to be a semantics question of the method index -  
so which semantics do we want?

This would be nice in the release but then we have to decide on this right away.
Of course we could just stick to topologyId and provide two utility classes....



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