- Reshape the architecture of the Kalman tracking to make it more modular

- Reshape the architecture of the Kalman tracking to make it more modular
  and similar to the Original one. Performances (efficiency, resolution,
  cpu time) of the new version are the same as before.
- Remove the class AliMUONTrackK.
- Add new options to the Original tracking that were available
  only for the Kalman.
- Speed up the last fit (accounting for multiple scattering) in the
  Original tracking.
(Philippe P.)