Added new decay files to effectively simulate signal and normalisation for Omega to Xi pi pi
The two decays
[Omega- -> (Lambda0 -> p+ pi-) K-]cc[Omega- -> (Xi- -> (Lambda0 -> p+ pi-) pi-) pi+ pi-]cc
are added. They have a momentum requirement on the proton from the Lambda decay of 9 GeV as that will happen in selection anyway due to positive proton ID. Also require Lambda to decay before 2m.