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Steffen Müthing authored
This commit removes a major amount of code that was required to support compilers without support for variadic templates, rvalue references or SFINAE on constructors. In particular, with this commit the minimum version requirement of dune-typetree is bumped to GCC 4.5 or compatible. As part of this change, VariadicCompositeNode and its accompanying tag were renamed to CompositeNode(Tag), so users *will* have to update their code!
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