Cleaned up hidden menu.

NOW:

    Score manager - active scores - hidden commands

        developer commands - toggle (dct)
        hidden commands - toggle (hct)
        menu commands - toggle (mct)

        LilyPond log - view (llv)
        Python prompt - interact (ppi)

        back - go (b)
        home - go (h)
        current score - go (s)
        next score - go (next)
        previous score - go (prev)
        quit (q)

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

        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)

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