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Problem with composite bases with more than two components spotted.

Jakub Both requested to merge test/multiple-component-basis into master

When constructing a composite basis with more than two components, a compiler error is spotted. A simplified test case is added for demonstration. For invoking the compiler error, uncomment line 46 of dune/functions/functionspacebases/test/, enabling the construction of a P1 x P1 x P1 basis on a quadrilateral grid.

According to the implementation of composite bases, this is not meant to happen. A static assert within the class DefaultGlobalBasis failed.

No fix is presented.

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