Add arguments parsing for `dico kernel` subcommand
The purpose of this merge request is to take care of the Python front-end for parameters parsing and subcommand processing.
Note: It is based on the master
branch so that it does not interfere with the C back-end development on the dico-kernel
branch. It should be merged into !5 (closed) at the end.
Edited by Alexandre Blondin Massé