Implemented new function to produce plots and tables for HLT seed and saturation studies

* Added function getEff_partial(...) to calculate efficiency with use of numerator and denominator histograms as inputs this is necessary to present the results of the HLT seeds study in the form of percentages of the HLT triggers
* Added function doTrigSeedStack(...) to produce stack plots to illustrate the change of L1T seeds percentage over the 3 TSG scenarios
* Added more descriptive comments to some sections of code
* Added code to use getEff_partial(...) to produced the tables for scenarios
* Added plot of L1T_ETM with overlap of all events and events with at least one ECAL TT, HCAL TT or RCT regions saturated.
* Added code to use doTrigSeedStack(...) and produce plots for all VBF parked triggers
* Fixed Y-axis ranges for many plots in order to present results
Fixing a bug that makes bin label order to not always be the same