Got the whole userspace<->cameraspace transition working, finally.  Currently the transform done to the image data is fixed, but the ROI transformation is not---that code is general.
Made the image transformation general.
Fixed issues with light being on a long time first time you take snapshot.  Also set ImageBrowser to have "autoscale to data" checked by default.
Started re-working the way the epi-light TTL is handles, to eliminate stutter-step bug.  This has required some refactoring.  Broken.