#3 demos/benchmarking

[Jordi Villà-Freixa]

DEMO: The documentation should also contain easy ways to run the code, and you need to provide simple examples on how to do it.
BENCHMARKING: a short script should be provided that runs the program for a limited set of known cases with a variety of input arguments. Such script is needed for everybody to check if the new additions he/she has made are compatible with the rest of the code