Added b-tag selection in tagging mode; fixed a bug in Z selection
Now storing full 4-vectors of trigger objects
Switching to looser collection of leptons for probes
Merge pull request #93 from senkin/fixed_trigger_objects

Fixes and add-ons for b-tagging and trigger workflows
Applying flags for both tagging and filtering selections
Requiring a signal lepton (for clarity) and some debugging info
Merge pull request #94 from senkin/fixed_trigger_objects

Selection in tagging mode and actual filtering
Fixing the optional b-tag selection in tagging mode
Merge pull request #95 from senkin/fix_in_optional_btag_selection

Fixing the optional b-tag selection in tagging mode