Adding code by A. Kiryunin

This is to add some jO and macros to compute HEC sampling fractions, developed by @kiryunin . Tagging @jchapman and @mduehrss .

Simulation/Tools/CaloSamplingFractionAnalysis/share/HEC_SamplingFractions/Analysis/10.1-FTFP_BERT/HEC_SF.txt

+ HEC front wheel :  0.044273 +- 0.000040  ->  0.04427 
+ HEC  rear wheel :  0.022708 +- 0.000021  ->  0.02271