- Fixed file permissions.

- Added reference for touch screen overlay. ...

- Split bar charts by device.
- De-colourised all graphics.
- Revamped definition of target sizes.
- Added more cross references.
- Fixed incorrect p value and non-adjusted error rates, etc.
- Moved combo box selection discussion from "Procedure" into "Design".
- Revamped percentage comparisons.
- Added combo box vs. Fitts' Law discussion.
- Tweaked a bunch of little things.

- Added learning spreadsheet and linechart script to generate learning ...

graphs.
- Cleaned up appearance of bar charts.
- Centred all figures