Remove old classes

After removing the classes TA2KensTagger, TA2KensLadder and TA2TAPS the TA2BasePhysics class was not working. BasePhysics try to access not existing method GetNParticles. In TA2Tagger this method is commented out. the Variable fNparticles for this Getter is part of TA2Apparatus, but there it is called GetNparticles (small p).

I have spoken to John and he was telling me that TA2Apparatus should do this. My point is that all methods in TA2Apparatus are with capital letters, like GetParticleInfo(), GetMaxParticle(), GetNSectorCut(), ... Only GetNparticle() has small letters. Due to compatibility we should keep it, but I would prefer a second one called GetNParticle(), like in this pull request.