Changed 'commands - hidden (hidden)' to 'commands - more (o)'.

The command enjoys enough usage to warrant single-letter entry.

Example:

    Score manager - active scores

        1: Betörung (2012)
        2: Čáry (2006)
        3: Huitzil (2013)
        4: L'archipel du corps (2011)
        5: L'imaginare (2010)
        6: Lidércfény (2008)
        7: Mon seul désir (2009)
        8: Poème récursif (2005)
        9: Red Shift Hijinks (2005)
        10: Sekka (2007)
        11: Traiettorie inargentate (2013)

        scores - new (new)

    > o

    Score manager - active scores

        1: Betörung (2012)
        2: Čáry (2006)
        3: Huitzil (2013)
        4: L'archipel du corps (2011)
        5: L'imaginare (2010)
        6: Lidércfény (2008)
        7: Mon seul désir (2009)
        8: Poème récursif (2005)
        9: Red Shift Hijinks (2005)
        10: Sekka (2007)
        11: Traiettorie inargentate (2013)

        scores - new (new)

        cache - view (cv)
        cache - write (cw)

        library - manage materials (lmm)
        library - manage stylesheets (lmy)

        repository - add (radd)
        repository - commit (rci)
        repository - status (rst)
        repository - update (rup)

        scores - show all (ssl)
        scores - show active (ssv)
        scores - show mothballed (ssmb)

        tests - doctest (tdoc)
        tests - py.test (tpy)

    >