An improved version of the fine refit of the tracks (CbmKfTrackFitter class). Only alignment and QA tasks should be affected by this MR.
The refit is done with explicit linearization of the trajectory.
At each node, parameters before and after multiple scattering are fitted.
The refit is based on the new KF material maps for the full geometry, which do not depend on the CA tracking setup.
Some improvements in the fit mathematics
Some improvements in the BBA alignment task
A corresponding unit test is under development and will be added soon.