D0 -> KS pi+ pi- pi0 (doubly tagged), 2017 MC

Doubly tagged D^{0}\rightarrow K^0_S \pi^+ \pi^- \pi^0 decays, where the D^{0} comes from a \bar{B} \to D^*(2010)^+ \mu^- X decay.

Processes 2017 MC from Dirac IDs 81820,81821.

JIRA task: https://its.cern.ch/jira/browse/WGP-229