obs_subaru and obs_lsst both still load charImage.py in their config/processCcd.py. Although the latter is only a gen2 file, we should fix that, and fix any other places that refer to that file to have them point to config/characterizeImage.py, which is the actual task name. We also need to swap the contents of subaru's charImage and characterizeImage, as the latter is where the config should live going forward.

This doesn't help configs that were written in gen2, but it will help us ensure that we have a chance of removing the config/charImage.py files at some point in the future.

I believe subaru and lsst are the only obs packages with this problem, but we should try to survey for it elsewhere.