Merge branch 'msaur_xibm_baryon_multibody' into 'master'

Multibody charmless decays of Xibm and Ombm.

See merge request !1634 (merged)

(cherry picked from commit 788e519b)

d978eb78 first attempt of 7body decays 95557a91 fixing descriptor 2e4ee6d6 descriptor fix 8f1aed0c fixing decfile name ce789464 additional Xibm badronic 7 body decays 463bd4fd Omegab decay 44029cea further development of Ombm modes ba79eced OmbmToOmmPhi b807dc56 filename fix 5fc138d7 filename fix 215988dc changing cuts 51aee7a2 chaning EventType based on the test suggestion 3e2017e8 adding angular cout flag, changing EventType for Ombm_OmmPhi 3fa110f3 additional decfiles for Xibm 5e8aa7ee changing extra flag to 3 for OmbmToOmmPhi per test requirements 5ffb4f33 same for OmbmToOmmKS 7830a07e adding numbers 86c9f5ed last available user flag value 1182986a switching neutral flag to 9 when no remaining free EvtType values c1b5e22d fixing naming for phi(1020) and KS0 c8541c25 fixing charge-conjugation for phi(1020) and KS0