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

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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 - Oliver Sander (sander)

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@Matthias: _dim is an unsigned char for historic reasons.  When I originally wrote the class it had two members basicType and dim.  Both are basically positive integers, and will never takes very large values.  Therefore I make _dim a char (and modified basicType) such that the entire class would fit into a 32bit word.  I never measured whether that actually did speed up anything.  Later people added more members, and the original idea got lost.  Feel free to change _dim to a bigger unsigned type.

@Christoph: Go ahead.  I think it is a good idea and chances of breaking anything are extremely low.
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