Adjust BTaggingChecker to interpret TagObjects from new FT Software

This is a cherry-pick of !338 (merged) for 2017-patches. Comes together with DaVinci!234 (merged) and Phys!380 (merged).

Ping @erodrigu @sakar @mschille

mentioned in merge request DaVinci!234 (merged)

mentioned in merge request Phys!380 (merged)

• [2018-06-27 00:26] Validation started with lhcb-2017-patches#429

merged

mentioned in commit 59c9426d