The changes to perform the trigger chamber efficiency determination from ESD

The changes to perform the trigger chamber efficiency determination from ESD
(without any modification of AliESDMuonTrack):
- Using the remaining 8 bits (only 7 bits needed for this purpose) of the
  trigger chamber hit pattern, which is already in the AliESDMuonTrack,
  defined as an UShort_t of 16 bits.
- Also included lots of changes in AliMUONTrackHitPattern and
  AliMUONTriggerEfficiencyCells (in this last class, just removed the data
  members and method for the original trigger efficiency calculation, which
  were not depending on local boards. In this way the calibration object gets a
  considerable reduction in size.
(Diego)