Add decfile for inclusive Lb -> He X decays

Decfile for simulating inclusive Lambda_b0 decays into helium-3. The He3 is required to be in acceptance (via ListOfDaughtersInLHCb).

The decfile was created from a decay table, which was obtained from pythia8 simulation of Lambda_b0 decays via b->u transitions, in which He3, and potentially deuterons, were formed through coalescence in an afterburner step.

The decfile is also required in Sim10 and was tested for Sim09 and Sim10, both.

Concerning the pipelines, there are the following cautions/warnings:

1. WARNING: Decay flag is not compliant. Should be 7. Please check

   Decay flag 9 seems more appropriate, as "The selected particle(s) is(are) forced to a decay chain containing some inclusive decays (semi-inclusive mode), resulting in a number of different final states which are not explicitly specified" seem to fit here.

2. WARNING: Track flag not compliant. Should be: 1. Please check

   The number of tracks is indeed a bit difficult for this one, but there should always be at least three charged tracks: The helium-3 and two negatively charged tracks, which is why 3 is used for now.

3. CAUTION: You have decay angular acceptance cut in Cuts but not in the nickname

   The acceptance cut ListOfDaughtersInLHCb is applied to helium-3 daughters. Correspondingly, HeInAcc is used in the nickname.

4. CAUTION: Descriptor not matched.

   The descriptor built by the parser ([Lambda_b0 -> He3 anti-deuteron omega pi-]cc) is the one for the most common decay mode, while the one currently used ([Lambda_b0 -> He3 X]cc) is more general.