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Fixed bugs in Bd_K1gamma,Kpipi0

Maria Vieites Diaz requested to merge mvieites/fixed_bugs_in_K1gamma into master

It was found that two decfiles (event types 1120260{1,2}) were affected by the following bugs:

Decay B0sig 1.000 MyK1_1270_0 gamma SVP_HELAMP 1.0 0.0 1.0 0.0; Enddecay CDecay B-sig <<-- changed to anti-B0sig

Decay MyK1430_+ 1.000 K+ pi0 PHSP; Enddecay CDecay MyK1430_+ <<-- changed to My*1430_-

Which result in the very uneven fraction of signal B0/B0bar events in sample and particle/antiparticle cut efficiencies seen in http://lhcbdoc.web.cern.ch/lhcbdoc/STATISTICS/SIM09STAT/RD-WG/Generation_Sim09-Beam6500GeV-2016-MagUp-Nu1.6-25ns-Pythia8.html#11202602

Other minor changes: Explicit definition of Alias Myrho+ rho+ ChargeConj Myrho+ Myrho-

Alias Mypi0 pi0 ChargeConj Mypi0 Mypi0 So that the event type check by the decparser succeeds.

The new names of the decfiles just contain *,updated.dec, please let me know if it should be anything different.

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