Smarter gel label placement?

[infotroph]

gel-labeler.py currently assumes that:

• There is about 1 lanewidth between lane 1 and the left edge of the image. Thus far this seems about right for 8-lane gels, and close enough for sufficiently close-cropped 15-lane gels.
• There is about 1.5 lanewidth between the top of the image and the row 1 wells, and that any further rows are evenly distributed through the remaining image height (i.e. row 2 wells are (image height - 1.5 lanewidth)/2 pixels down). This works OK for 8-lane gels but puts the labels too high on 15-lane gels. Could this be expressed as a less variable proportion?
• Lane IDs will be readable if rendered in white 18-point type and rotated 18 degrees counterclockwise. This is only true for very short IDs -- for longer labels, more rotation or actual human input may be necessary.

Low priority; these are all mostly for our quick reference and need not be publication-quality.

[infotroph]

We didn't end up using gels for any of the final data from this project, so I see no need to fix this.