FORMATS:
    NEW:
        - microsoft office < 2007 (ugly and insane)
        - fix zip (fix python's ziplib) !!!
        - videos format ?
    ARCHIVES:
        - correctly handle mtime/atime for files inside archives

GUI:
    - Add a popup to warn the user about non-supported format because of missing dependencies
    - Correctly handle the case of the user tick "backup", clean, and then untick "backup":
        -- remove the backup copy ?
        -- refresh the state of files maked 'clean'

MISC:
    - a nautilus extension (right-clic -> clean with MAT)
    - support non-utf8 filenames

TESTSUITE
    - add a ctime/mtime related test