Changes to Charged-Neutral conditions (Particle reconstruct)

Setting up basic outline for improved "charged particle marking". This is a seperate parameter to full charged particle identification (ie dE_E cuts) which looks at the energy deposition in the charged particle detectors to mark a particle as charged. Due to experimental problems with individual detectors, this must be done in a way which is possible to completely ignore the information from an individual detector.
Updates to PEta class

Small updates to reflect changes in PPhysics class (HistFile for histograms to seperate from tree file)