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Save track Chi2 in Cascade fitter

Vadim Kostyukhin requested to merge vkost/athena:VKalVrtCascade_Trk_Chi2_21.2 into 21.2

Save track Chi2 instead of track charge wrongly used previously in VxTrackAtVertex constructor. The fitter performance is not affected at all, just Chi2 per every track in vertex was not available. This additional information may be used in b-physics analyses to improve selection.

Edited by Vadim Kostyukhin

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