[Dune] [#587] GenericReferenceElements should use unsigned for indices, sizes etc.

[Dune]

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The following task has a new comment added:

FS#587 - GenericReferenceElements should use unsigned for indices, sizes etc.
User who did this - Matthias Wohlmuth (matthias)

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May I ask about the situation in dune/common/geometrytype.hh: 
It is stated that both constructors with types unsigned int and int for the dimension are needed to distinguish between topologyId and dim. I'm not sure if I like that, but at least it seems to be intended. 
However, is there a reason that the member _dim is stored as unsigned char. This results in -Wtype-limits warnings when _dim is set in the int/unsigned int constructors... 

Probably, that's not a big deal, but I'm just curious.... 
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