Introduce VeloBackward and track type
Follows LHCb#256 (closed).
Goes with LHCb!3779 (merged) Alignment!314 (merged) Panoramix!122 (merged) and Rec!3122 (merged)
Edited by Andrii Usachov
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Follows LHCb#256 (closed).
Goes with LHCb!3779 (merged) Alignment!314 (merged) Panoramix!122 (merged) and Rec!3122 (merged)