Some first draft function for prediction error calculation
Merge branch 'master' into prediction_errors

Conflicts:
	extractor/extractor.h
Merge branch 'master' into prediction_errors

Conflicts:
	extractor/extractor_yields.cc
Merge branch 'master' into prediction_errors
Add some code comments specifying the content of some members
Automatically rescale graphs to not intersect with all the labels.
adapt fitting parameters
Add first "working" version of getPredictionUncertainties for yields
Add prediction errors for yields. Still not in a working state,
better run with -f nopred for now