Flattened repository management menu.

Current score manager (hidden) menu:

    Score manager - active scores - hidden commands

        display calling code (where)
        display hidden menu (hidden)
        edit client source (here)
        execute statement (exec)
        go back (b)
        go home (home)
        go home (H)
        go to current score (score)
        go to current score (S)
        go to next score (next)
        go to prev score (prev)
        quit (q)
        toggle menu commands (tmc)
        toggle where-tracking (twt)
        view LilyPond log (log)

        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)

    >

Note that the old (rep) command has been removed.

Note that 'rep' will now interpret as the first three characters of
'repository - add (radd)'.