Compare two calibrations of a display.
Refits all files to with common number of primary bases and gamma fitting method.
These are prompted for.
1/20/05 dhb, bx Wrote it.
2/12/10 dhb Don't ask for load code, just prompt for name.
dhb Better plots. And, ask for which times to compare.
2/15/10 dhb Fix input, not a string.
3/1/10 dhb Allow drawing from different files, refitting data, etc.
6/23/11 dhb Make a chromaticity plot of the comparison as well.