Add capability to load full image

[ijiraq]

Add capability to load full image

[drusk]

@ijiraq I assume you would you want to see the full image in the matplotlib image viewer? But should it come up separately from the main image viewer window so you can still go through the cutouts while looking at the full image?

[ijiraq]

@drusk there are a couple of features this mode should provide.

• display the entire image, in a separate viewer is fine or in cutouts works too.
• overplot all the detections in that view. Overplot should show the location of the source at all three epochs on a single image. Highlighting the view epoch in a different colour.
• allow the user to click and delete detections from within that view, perhaps selecting entire regions of detections for deletion.

This view is to allow large numbers of false detections to be rejected quickly. Normally this is useful when a particular CCD has an anomalously high number of candidates.