Merge devel branch
- New phase spaces:
- CombinedPhaseSpace: combination (direct product) of two other phase spaces. Replaces DoubleDalitzPhaseSpace as more generic.
- VetoPhaseSpace: veto specific ranges of variable in any other phase space.
- Added square Dalitz plot functions (transformations and Jacobians) to DalitzPlotPhaseSpace
- Allow changing single/double precision.