Pass6 tweak reconstruction release

This release will be used to generate DST's from pass6 tweak pass reconstruction files. The DST's will be used in the un-blinded bump-hunt analysis.

What's New

• GBL was removed as a dependency
• CMake configuration was made compatible with ROOT 6

Bug Fixes

• Remove > 1 entry requirement when processing RF hits
• Ecal hits are no longer added multiple times if shared in a cluster
• Add getter used to retrieve the # of MC particles