small changes to AEvent::SmoothGraphs, new scripts to see channels correlations are added. 01 - ch0 and ch1 , 02 - ch0 and ch2 and so on

Function SmoothGraphs is added, script for viewing smoothed graphs is testShowSmooth.C  Also the fTimeMid variable is added (time in the middle of front edge)

AEvent: function for calculating charge by front time value is added. Script histCorrNew.C for new pictures is made

AEvent::SetCFD() modified: signal modifications are now fully based on its graph and not on graph points

AEvent::FindFrontProperties is modified to suit DRS4, script for drawing correlation is complemented