Change default source file for testing

PAT service to provide source files for testing in the CMSSW release
used do not work properly anymore. Relevant block of code is commented
out.
Fix #30 (save jet area)
Change PlainEventContent to store raw jet momentum instead of corrected
Change to raw jet momentum in calculation of the pull angle

Cannot use the corrected momentum since it would make the pull angle
depend on JEC, and this systematics cannot be calculated offline.
Though, the difference is expected to be negligible.
Extend PlainEventContent to save JEC factor

Allows to obtain corrected jet momentum from the stored raw one. It
finally fixes #31.
Correct access to jets smeared for JER

Access to information on JER smearing is updated to match the recent
switch to raw jets.
Remove storage of integral properties of "soft" jets
Fix #21 (electron MVA ID cut before top projections)