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[bugfix] Make static members constexpr

Carsten Gräser requested to merge bugfix/fix-odr-static-members into master

static const members need a definition at namespace scope if ODR-used. Here the static member dim is passed to a stream which may (or may not) be ODR-use. The fact that it works so far is a lucky conincidence since DUNE_THROW happens to be a non ODR-use. Since C++17 static constexpr members are implicitly inline, they don't need a namespace scope definition even if ODR-used.

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