Make fuzzy search case insensitive

This solves the following irritating situation:
$ ./toutv-cli.py list trauma
Unable to find 'trauma'
Did you mean 'Trauma' instead of 'trauma'?

Difflib does not allow for native case insensitive search. This pull request is to treat everything as uppercase (both the user query and the possibilities array).

One downside is the suggestions are now displayed in upper case instead of the original case, however I think it is quite minor. 
$ ./toutv-cli.py info trauma patience
Unable to find 'patience'
Did you mean 'PATIENCE ET RAGE' instead of 'patience'?