SumOfWeights added to TH1 stats
Merge branch 'overlay' into d3Rendering
Overlay rendering -> todo error bars
rendering needs  server part to be changed
Normalization of overlay hist is made by root. Integral for TH1 moved to stats. Same refactorisation
Merge branch 'overlay' into d3Rendering

Conflicts:
	src/javascript/DQM/Canvas.js