First production version for UL2017

This release includes:

• PFcands for AK4 CHS and AK8 PUPPI jets. (There is an additional option for all PFcands if needed, or only AK4 or AK8)
• Specific BTV information for ML-based taggers.
• Content according to nanoAODv6.
• Including DDBv2

Including JME nano

• Including files for nanoAOD v6 and v7
• Includes recipe for JMECustomNano
• Includes more info in README

JMARnano based on nanoAODv4

First production version. All the samples created in with this release are here:
https://twiki.cern.ch/twiki/bin/viewauth/CMS/JetMET/JMARNanoAODv1