start on operator< for tags and related changes to TagSorter
regularize inheritance structure.  DiPhotonTagBase::diPhoton now behaves. Persistification having issues though
new polymorphic base class for tags, OwnVector, &c.
finally have new class structure making sense and working in tests
check in updates now that TTHlhadronic/leptonic tag working (rebase next)
remove most of the debug messages
typo from merge, more expansive TTHleptonic message
add back ommitted storage of VBF MVA object in VBFTag
Merge pull request #98 from sethzenz/tag_structure_2

Tag structure 2