runtime switch for the generation of MPI datatypes
There are now two ways to generate dataypes (src/xt_mpi.c)
(a) fast, but without exploiting potential for a compact description
(b) less fast, but with ...
So far the switch is a cpp symbol: COMPACT_DT in src/xt_mpi.c
We need a runtime switch in order to test both versions without recompilation
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