FEX has been replaced by TweetyPy
As FEX developed my primary goal was to make it a cross-platform tool (to run on Windows / MacOS / Linux) rather than being restricted to Linux systems. To reach this goal, FEX was completely rewritten, and I found that the new organization of the code allowed for a much more flexible tool. This resulted in an expanded scope for the tool, and a rename as it will (eventually) do much more than Frequency Excursion calculations.
If you were looking for FEX, please use TweetyPy1. instead. This repository is only for exploring the development stages that Fex / TweetyPy went through and should not be considered stable or usable.