[general need] Make a robust command line interface to launch Mia

[servoz]

We have started adding some elements using argparse in the main module.

This was done hastily in order to meet a development need (use of Mia in single or multi-instance mode).

We need to review this implementation and add features/documentation in order to provide a comfortable user experience.

We can list the features that should be offered in this ticket.

• Single or multi-instance mode
• Verbose mode (information/warnings in stdout) or not (no stdout output). Redirect the information to a log file option?
• Perform the installation before launching Mia (include the mia_install repository in populse_mia ([general need] Include Mia's installation when starting Mia #28)).
• To be completed...