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Add TupleDiscontinuousGalerkinSpace

Martin Nolte requested to merge feature/tuple-dgspace into master

A TupleDiscontinuousGalerkinSpace create the product space of given DiscontinuousGalerkinSpaces. In contrast to a TupleDiscreteFunctionSpace, the product space is constructed on the level of shape function sets. As a result, the DoF mapper remains a CodimensionMapper and the localBlockSize is the sum of the underlying localBlockSizes.

In the context of pure DG computations, this space is slightly more efficient than the TupleDiscreteFunctionSpace.

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