Changelog

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+Improved: MappingQGeneric::transform_real_to_unit_cell() has been made much
+faster by directly working with the tensor product form of the mapping shape
+functions and avoiding many unnecessary memory allocations. The main cost is
+now MappingQGeneric::compute_mapping_support_points(), which can be made fast
+with MappingQCache, for example.
+<br>
+(Martin Kronbichler, 2020/09/30)