Merge pull request #161 from bcumming/bug/mpi

fix bug introduced when global policy was refactored.

The reproducible problem is now green on two separate systems

tests/global_communication/test_mpi_gather_all.cpp

@@ -5,7 +5,7 @@
 #include <cstring>
 #include <vector>
 
-#include <communication/mpi_global_policy.hpp>
+#include <communication/global_policy.hpp>
 #include <communication/mpi.hpp>
 #include <util/rangeutil.hpp>