In plotter:  - Fixed bug related to histogram  - Changed behavior of mouse-wheel zoom Signed-off-by: Hauke Strasdat <strasdat@gmail.com>
In plotter:
 - Fixed bug related to histogram
 - Changed behavior of mouse-wheel zoom
Signed-off-by: Hauke Strasdat <f9a5700550db52a0d3c8d4221881dbb5f5599b5b@gmail.com>

renzodenardi/Pangolin,janjachnik/Pangolin,tschmidt23/Pangolin,randi120/Pangolin,mp3guy/Pangolin,GrimDerp/Pangolin,arpg/Pangolin,pinglin/Pangolin,mp3guy/Pangolin,wxdzju/Pangolin,wxdzju/Pangolin,GrimDerp/Pangolin,janjachnik/Pangolin,visigoth/Pangolin,visigoth/Pangolin,randi120/Pangolin,mp3guy/Pangolin,stevenlovegrove/Pangolin,stevenlovegrove/Pangolin,contradict/Pangolin,stevenlovegrove/Pangolin,arpg/Pangolin,renzodenardi/Pangolin,tschmidt23/Pangolin,contradict/Pangolin,tschmidt23/Pangolin,pinglin/Pangolin