Core: Fixed Ladder reconstruction of MC events

This is to fix an issue that I had discovered with Monte Carlo reconstruction in the tagger, specifically in TA2Ladder.cc. The problem existed in two parts. First, the overlaps are not determined correctly when not specified in the config file. Second, the indices for dE1 and Eh1 were incorrect. This also adds a small fix that John had added to keep iHit within the limits of the tagger, without which it would sometimes crash.