Changed Diatrack Edge Cutting so the default filetypes listed are .txt and will add .txt extension for the save dialog
Added a couple of scripts to about identification of particles using nkeim's particle identification code.

One of the scripts is for testing purposes while the other will be the
final script to actually do the identification and tracking. The
functions in the Fourier Transform.py have been slightly modified to be
similar to functions found in the other scripts