Changelog

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+New: There is a new function DoFRenumbering::matrix_free_data_locality() that
+re-orders the unknowns of the unknowns in a DoFHandler to give optimal data
+locality of pre- and post-operations in matrix-free loops.
+<br>
+(Martin Kronbichler, Peter Munch, Alexander Roschlaub, Dmytro Sashko, 2022/04/21)