Fixed single precision compatibility issues

extras/Hadrons/Modules/MContraction/Meson.hpp

@@ -181,7 +181,7 @@ void TMeson<FImpl1, FImpl2>::execute(void)
         LatticeCoordinate(coor, mu);
         ph = ph + p[mu]*coor*((1./(env().getGrid()->_fdimensions[mu])));
     }
-    ph = exp(-2*M_PI*i*ph);
+    ph = exp(-(Real)(2*M_PI)*i*ph);
     
     parseGammaString(gammaList);