add ifdef to allow compilation without mpi
git-svn-id: https://ppm.inf.ethz.ch/svn/ppmnumerics/branches/ngtopo/libppmnumerics@1029 7c7fe9aa-52eb-4d9e-b0a8-ba7d787348e9
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git-svn-id: https://ppm.inf.ethz.ch/svn/ppmnumerics/branches/ngtopo/libppmnumerics@1029 7c7fe9aa-52eb-4d9e-b0a8-ba7d787348e9