[Bug] Fixed damper unit as nano sec

Phase context aggregation was failing as the damper unit was in seconds
insted of nano seconds. This has been fixed now

See Issue #2

mpi_nrm.h

@@ -21,7 +21,7 @@
 static unsigned int _transmit = 0;   
 // Phase shorter than this will be aggregated - Set using NRM_DAMPER environ (in
 // seconds)
-static double _damper = 0.01;    
+static uint64_t _damper = 10000000;    
 
 // Book-keeping and Statistics
 static unsigned int _aggregation = 0;