This program was created as a part of Probability and Statistics class to Simulates Galton Watson process.
Outputs a .xlsx file, with data and few charts. Name of the file can by specified by -o argument.
Default output file consist of input parameters.
Use --help to get all optional arguments.
Because Excel can't handle more then 256 series in one chart, if initial entities (-n) exceeds this number,
chart won't be complete. However, chart will be created using mathplotlib in separate .png file.
But this process can take a long time. At this time, program can be terminated safely, without losing .xlsx file.