Changelog

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+New: There is a new initialization function MGTwoLevelTransfer::reinit() that
+takes two MatrixFree objects to describe a p-coarsening transfer operation,
+besides the previous option of computing the information via two separate
+DoFHandler objects. The new option is faster to set up and more memory
+efficient in case the MatrixFree objects already are available, such as when
+using those to define the level operators.
+<br>
+(Martin Kronbichler, 2024/07/22)