Merge branch 'slopezso/second_signal_masses_DM' into 'master'

Add 9 signal DecFiles to B mesogenesis and DM analysis. Two decay modes, 5 masses and 4 masses.

See merge request !1819 (merged)

(cherry picked from commit fa340f8a)

9652ea3c add 4 decfiles for some masses i was missing cca0b77e add 5 decfiles to other decay mode