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Add missing static member max_size in flatmultiindex

Simon Praetorius requested to merge simon.praetorius/dune-functions:issue/flatmultiindex_max_size into master

Summary

Added static member max_size in FlatMultiIndex class.

Motivation

In CompositePreBasis the SizePrefix is defined as Dune::ReservedVector<size_type, MultiIndex::max_size()+1>. This requires max_size() to be a static member of the MultiIndex type. A FlatMultiIndex is derived from std::array that has no static max_size, only a memberfunction max_size that can not be used in this context.

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