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Kf: improved version of the fine track refit

Sergey Gorbunov requested to merge se.gorbunov/cbmroot:fitQA into master

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.

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