Position and text size of miller index overlay

[dagewa]

The "Nearest HKL" view is really nice. Having played with it for a while I have the following suggestions:

• The position of the text should always be where it is when "Predictions" only is selected
• This position should be shifted slightly to the right and up of where it is at the moment to avoid collision with the prediction cross
• If only "Predictions" is ticked, then the text should only appear for spots on the image that contains the predicted centroid position
• If "Observations" is selected (with "Predictions" either on or off) then the text should appear on every image that has a green shoebox displayed for that spot, but the position of the text should be where the prediction would place it.

[dagewa]

The text should also be a legible size whatever the zoom level of the image. At the moment, the text resizes with the zoom level, which makes it useless when fully zoomed out