Kf: improved version of the fine track refit

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.

requested review from @s.zharko

assigned to @se.gorbunov

changed title from improved version of the fine track refit to Kf: improved version of the fine track refit

added 1 commit

• e9e0b56f - Kf: new version of the track refit

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added 6 commits

• fc5a2760 - 1 commit from branch computing:master
• 79ff2523 - Kf: tune the material effects
• 2ffcc880 - Kf: tune the treatment of the unmeasured coordinates (TRD-1d)
• 78883dc2 - BBA: update
• 81eb8551 - Kf: replace KfTrackParamBase with KfTrackParam
• d6f65099 - Kf: new version of the track refit

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Dear @d.smith, @fweig, @se.gorbunov, @s.zharko, @f.uhlig, @v.friese, @p.-a.loizeau,

you have been identified as code owner of at least one file which was changed with this merge request.

Please check the changes and approve them or request changes.

added CodeOwners label

merged