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Update computation/export of connectivity information in VTKMeshWriter and AdiosWriter

Marcus Mohr requested to merge mohr/dataExportUpdates-v2 into master

This MR brings two main updates:

  1. Computation of connectivity by the routines in VTKMeshWriter now consistently uses HyTeG's uint_t and leaves conversion to the desired integer datatype for export to the output stream object.
  2. The second change was triggered through a request by the Fortran users in the TerraNeo community. We now support a compile time option HYTEG_USE_SIGNED_INT_FOR_ADIOS2. If this is activated the AdiosWriter will use int64_t as datatype for the connectivity information when exporting for ParaView. Otherwise it will use uint64_t.

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