fix recently introduced off-by-one bug in parallelmesh, clean up created MPI-types (needs array-pos merge request)
fix recently introduced off-by-one bug in parallelmesh, clean up created MPI-types (needs array-pos merge request)

live-clones/netgen,live-clones/netgen,live-clones/netgen,live-clones/netgen,live-clones/netgen,live-clones/netgen