Convert distortion script into more general plotting code

The code to compute a distortion model in DM-18845 seems to do the job. It would be nice to turn it into something that could be run on any jointcal output, since jointcal does not yet produce an "official" distortion model (the atmosphere is still mixed in). I could see this being useful to look at jointcal's output, and would propose to put it into jointcal/bin, along with the existing plot_photoCalib script there.

The existing code has a butler and other things hard-coded: we can replace that with ArgumentParser options that load the appropriate data, and maybe some to make adjustments to the plots (maybe turning on/off the default CameraGeom overplot?).

Would it be possible to have the code output an updated distortion model or Camera geometry from the mean of its inputs? That seems like another reasonable cmdline argument.