Draft: add D0->K3pi mode for DiCharm

Ivan Polyakovrequested to merge
BandQ_D02K3pi-ForDiCharm_2018-patches into BandQ_2018-patches

main motivation is the Tcc->D0 D0 pi+ channel where adding D0->K3pi mode may increase statistic by x2.

Implemented by substituting D02Kpi with D0, which is a merge of D02Kpi and D02K3pi. Thus, all lines like of DiCharm, TriCharm, ... and so on will benefit.

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