Cleanup in the data directory
Updated data files for multiple processes

The data files now carry their own metadata, making it easier to read data for the implementations.
Multiple process interpolation

The interpolation now works better for multiple processes. The input file is shortened to carry only the number of processes and their data files, and the metadata for the processes is read from the first line of the respective files.
Added total collision frequency
Removed old models for energy sharing and cross-section
Created indata tester

The indata tester is a short program that looks at the input file and calculates some quantities based on the parameters. It can be used to check that a set of parameters is reasonable, or will produce valuable results, before running the program.
Multiple processes

Multiple processes are taken into account in the simulation.