[low priority] GCC warnings

[MatthieuSchaller]

Just spotted some warnings when compiling with GCC. Probably nothing but could be leading to something more nasty in the future:

/data1/matthieu/Velociraptor/VELOCIraptor-STF/stf/VELOCIraptor-STF/NBodylib/src/Math/GMatrix.h: In member function ‘Math::GMatrix Math::GMatrix::operator+(const Math::GMatrix&)’:
/data1/matthieu/Velociraptor/VELOCIraptor-STF/stf/VELOCIraptor-STF/NBodylib/src/Math/GMatrix.h:155:5: warning: control reaches end of non-void function [-Wreturn-type]
     }

and

/data1/matthieu/Velociraptor/VELOCIraptor-STF/stf/VELOCIraptor-STF/src/mpiroutines.cxx: In function ‘int MPIGetParticlesProcessor(Double_t, Double_t, Double_t)’:
/data1/matthieu/Velociraptor/VELOCIraptor-STF/stf/VELOCIraptor-STF/src/mpiroutines.cxx:229:1: warning: control reaches end of non-void function [-Wreturn-type]
 }
 ^
/data1/matthieu/Velociraptor/VELOCIraptor-STF/stf/VELOCIraptor-STF/src/substructureproperties.cxx: In function ‘double mycNFW_fdf(double, void*, double*, double*)’:
/data1/matthieu/Velociraptor/VELOCIraptor-STF/stf/VELOCIraptor-STF/src/substructureproperties.cxx:4287:1: warning: no return statement in function returning non-void [-Wreturn-type]
 }
 ^

The MPI one could be worth investigating since we touched upon MPI-ranks related problem lately.