New productions for MC/Data TDCPV and 2015 3hG + python3

New productions for:

• TDCPV: Data (Full Run1 & Run2), MC [12, 16, 17, 18] & [13102202, 13102263, 11102202, 11102204] (bs2phigamma, b2kstgamma)
• 3hG: Data 2015

Additionally

• Code to py3

Does not supersede a full production but parts of older ones (from CharmWGProd):

• lhcb-datapkg/WG/CharmWGProd!128 (merged)
• lhcb-datapkg/WG/CharmWGProd!120 (merged)
• lhcb-datapkg/WG/CharmWGProd!97 (merged)

ADD PRODUCTION DESCRIPTION HERE!!!

Instructions

When creating your merge request:

• Add a label for your WG
• Mark as "WIP:" until you're happy with the CI results
• If the merge request supersedes a previous one, add a comment at the end of the header: (supersedes !<MR number>). Please state explicitly in the description if the superseded ntuples can be deleted immediately, or after the new merge request is finalised

When ready:

• Remove the "WIP:" from the title:
• Assign the merge request to you working group's DPA/RTA liaison

To find your working group's DPA/RTA liaison, see this page:

https://twiki.cern.ch/twiki/bin/viewauth/LHCbPhysics/LHCbWGLiaisons