WIP: Stripping lc2 l0 l lpi.py
we write the stripping cut of Lambdac ->(Lambda -> p+ pi-) pi+
--The StrippingLc2L0LLpiLine, which used StdAllLoosePions + StdLooseProtons instead of StdLooseLambdaLL . The reason is that we find that the PT cut of pion (Pi_PT>250MeV) in the original code is too tight. therefore we remove this cut in the new code. --PT > 750MeV (for piplus) change to PT> 0MeV(for piplus)