added electron isolation from deposits; use larger mc samples for DY->ee
and mumu; added maximum wallclock time for crab
added preselection for emu+ee+mumu (for T-variable)
doPATMet works now
added MET uncertainties (only available in PAT)
removed computation of pdf systematics by CMSSW
removed unnecessary triggers
Merge pull request #6 from anehrkor/master

Switched to pat MET, added MET uncertainties and other small changes