also fill fake_tight, fake_loose histos (needed to avoid subtraction in MC, double counting err)
compute_fake_el_scale_factor: also print errors
compute_fake_el_scale_factor: do not subtract real from MC

for MC we know the total fake, so we don't need to subtract
the real contribution from the tight&loose histograms (which
double-counts the error on real...small but visible difference)
compute_fake_el_scale_factor: rearrange, save sf histos
samesign requirement applicable to hflf only
drop mode option, loop hflf+conv inside script
eta-dependent scale factor
Merge pull request #56 from gerbaudo/apply-eta-dep-sf

Apply eta dep sf