ADC non linearity correction
This is trying to implement the ADC non linearity correction into the egamma energy calibration tool.
A new class has been introduced (from @gunal), that does the correction (depending on etaCalo, ET and the particle type). An uncertainty about 30% of the correction is also introduced (to be checked and size to be discussed)
More details here https://its.cern.ch/jira/browse/ATLASEG-242