Heppy LeptonAnalyzer: updates and more sensible defaults:

- include EAs for isolation in Phys14 25ns samples
  (Data2012 ones are also provided)
- fix electron isolations for R=0.4: before deltaBeta was dummy,
  and rho*EA was using the R=0.3 effective area
- the deltaR cut in the electron-muon cleaning was applied to
  deltaR2 instead of to deltaR, now fixed.
- the default electron tight id was 'MVA' but MVA Id is not yet
  in Heppy so it was dummy: switched to Cuts_2012
- Cuts_2012 electron tightId moved to full5x5 clusters