Double charmonia same sign production (supersedes !621)

Yajing Weirequested to merge
weiyj/double_charmonia_EMTF into master
  • Fix bugs in MR!621
  • Add samples for Hlt2BandQ_DoubleCharmSameSign
  • create samples with and without the prefilter to check whether they have any differences
Edited by Yajing Wei

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