1. Update to AliESDtrack

1. Update to AliESDtrack
- Adding "golden TPC cut" on chi2 between tpc only track constrained
  to the vertex and the global track. The code is an adapted version
  from the implemention provided by the RAA group (Jacek et al).
- The calculated chi2 value is cached to avoid the computing-intensive
  operation several times in train running.
- New function that returns the number of crossed rows and caches it
  (suggestion by Jens W).

2. AliESDtrackCuts has been optimized
- Golden cut added. Therefore the prototype of AcceptTrack needed to
  be changed (backward compatible). One needs to pass the event as well
  when the new cut is to be used.
- CPU intensive cuts are only evaluated when other cuts have
  passed (Nsigma, golden TPC cut).
  NOTE: Control histograms are only filled for those quantities when the other cuts have passed