add decay description files for higher energy simulations
Fix issues with fill module

- For some reason, accessing map entries using [] operator doesn't work
  anymore. strange!! Replaced with iterator based search to enable
  running
- Added boosted functions for invariant variables. It calculates them
  without boosting, but allows defining 2d fillers with one boosted
  variable and an invariant
Improvements to jpsi-pi0 signal event generator

- Add u-channel event simulation. Now both t and u channel are done in
  the same simulation pass
- refactor parts that don't need to be computed for each event
- Fix minor bug in formulas
Remove unecessary cout
Modify signal generation macros to handle multiple beam momenta
No verbosity
no comment
Modifs to steering scripts to handle multiple beam energies