Added new files for study of B+ -> Lambdabar ph h decays

This is related to MR 1314, 1319, 1386, and 1428, with same gen-level cuts on tracks.

.dec files have been tested locally.

The included decays are listed here, which are some possible background sources for B+ -> Lambda0bar p h h studies

B+ -> (Lambda -> p~- pi+) (Lambda(1520) -> p+ K-) pi+ B+ -> (anti-Lambda_c- -> (Lambda -> p~- pi+) K-) p+ pi+ B+ -> (anti-Lambda_c- -> (Sigma -> (Lambda -> p~- pi+) gamma) K-) p+ pi+ B+ -> (Sigma -> (Lambda -> p~- pi+) gamma) p+ K- pi+ B+ -> (Sigma -> (Lambda -> p~- pi+) gamma) p+ pi+ pi- B+ -> pi+ (eta_c -> p+ (Lambda -> p~- pi+) K-)

cc @lsun @yitang