add enumFactory and SelectionRegions
import all sr enum from SusyAnaDefsMatt, SusyPlotter, SusySelection
gradually switching to new SelectionRegion enum

Details
- SusyAnadefsMatt: comment out CR_N
- FakePlotting: comment out unused functions using CR_N
- MeasureFakeRate2: define max num sr, define vector of sr and cr
FakePlotting: major cleanup; drop everything except DataMCSF
MeasureFakeRate2 : some major cleanup
iterative corr: translation to python
MeasureFakeRate2::Process: align
IterativeFakeCorrection::iterate: align&indent
iterativeCorrection.py: move ratioHisto to outer scope for reuse
verbose lines: vertical compress
plot input histograms
shorten FILL macro
provide some description of the method

Details:
clarify what CR_HF and CR_HF_high are; try to explain what are the
values that are updated from one iteration to the next.
Still not happy with it. Review the 2l note.
MeasureFakeRate2: align and vertical compression
SusyPlotter: drop obsolete regions
FinalNewFake::getFakeRate : drop default arg, clarify isConv when necessary
move binning to SusyAnaDefsMatt
SusyAnaDefsMatt: major cleanup of old enums and names
add cr to compute fractions also there
move SsPassFlags to a separate file