Quick 'n dirty wxPython plot digitiser

There are a number of digitisers out there, but I wasn't happy with any of them - they either gave me weird results or didn't work on Linux. Also I hadn't played with wxPython in a long while.
Dependencies: wxpython, PIL, numpy, scipy.
What it does:
  - manual or automatic (scatter or line) detection of plot points by colour. 
  - axis calibrated ascii (x,y) data export.