Code Cleanup: Remove trailing spaces
Add a udev rules file to be dropped into /etc/udev/rules.d/

Closes #1
Get rid of magic numbers in demo.py

- Consistently use TextLines.ALL
- Use True/False for booleans passed to display_network_info()
Implement a hack to allow coloured two-column text.

- Add support for limiting the length of the padding so that, if column 2
  is drawn first, column 1 can be drawn without erasing it.
- Add a COL2LEFT constant for using padding to implement left-aligned
  text in the second column.
Implement faster single-color drawing for two-column text.

(Basically, implement support for the TAB character)

Closes #2