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WIP: Get rid of Clang warnings "cast increases required alignment"

Christoph Grüninger requested to merge feature/warning-cast-increases-required-alignment into master

I successfully got rid of the warnings. But I am not sure whether this is the correct way.

Please can someone review and approve my changes?

The Clang warnings were like

/temp/gruenich/dune/complete/dune-grid/dune/grid/uggrid/uglbgatherscatter.hh:115:35: warning: cast from 'char *' to 'DataType *' (aka 'double *') increases required alignment from 1 to 8 [-Wcast-align]
          DataType *dataPointer = (DataType*)(buffer + sizeof(int) + paramIdx*sizeof(DataType));
                                  ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

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