Added "Spotlight" feature in scan comparison mode.
toggle dose off in scan comparison mode.
Added spotlight feature in scan comparison mode
1> Added cases for spotlight init, motion and exit.
2> Fixed zooming in/out/reset for linked axes.
Added trail for cursor motion.
Fixed sorting of doseArray for single-frame dose data
Merge branch 'master' of github.com:adityaapte/CERR into compiled