MaCh3 Modes for GENIE

[EdAtkin]

GENIE does not have a 1:1 mode mapping because NC and CC events correspond to the same integer. This breaks the use of the ModeMap in the MaCh3Mode object. We should think about how to incorporate this into the object.

[pjdunne]

So it looks like what we need is to make this not
std::map<int,int>
but
std::map<int,std::vector >
Then if your vector is size 1 all is good. If your vector is size 2 you check iscc

So the existing function can stay but now just returns:
m3mode=ModeMap[Index];
if m3mode.size()>1{throw;};
else(return ModeMap[Index][0])

and the 2D function just goes and checks both the modes that get returned if the vector is length 2