Few fixes and additions, mostly targeted to FWLite compatibility.

Changes to flashgg::Photon:
- Modified charged iso accessor to work with FWLite.
- Also added trailing _ to all data mebers.
- Recover shadowed reco::Photon isolation methods.

Imported parallel python module for job workflow control.
Merge pull request #107 from musella/topic_fwlite_debug_rebase

Few fixes and additions, mostly targeted to FWLite compatibility.