caljsoncheckfunctions.py: refine error-image plot.
caljsoncheckfunctions.py: refine error-image plot.

 - improve tick marks
 - make zooming work in interactive viewer
 - add labels to axes
 - adjust spacing with colorbars to make room for labels.

tobeycarman/dvm-dos-tem,tobeycarman/dvm-dos-tem,tobeycarman/dvm-dos-tem,tobeycarman/dvm-dos-tem,tobeycarman/dvm-dos-tem,tobeycarman/dvm-dos-tem