ASF update

Removed a lot of extra code that I only used for ASF validation / comparison of results. ASF now updated to calculate distance in y-phi plane rather than eta-phi (since this seems to be the 'standard' implementation). Partial mass calculation now identical to the one in the ROOT code I initially adapted - it scales very differently from the SpartyJet way of doing it and seems to be how the original ACF paper did it. In short I think the SpartyJet way of doing the calculation normalises by the jet mass so that two jets in very different mass scales but identical (relative) substructure get the same result, whereas this implementation does not (and hence the partial mass at least naively has more physical meaning).