Updated main menu.

Example:

```
    Score manager - active scores

        1: Betörung (2012)
        2: Blue Example Score (2013)
        3: Čáry (2006)
        4: Gebiete (2013)
        5: Green Example Score (2013)
        6: Huitzil (2013)
        7: L'archipel du corps (2011)
        8: L'imaginare (2010)
        9: Lidércfény (2008)
        10: Manifolds (2013)
        11: Mon seul désir (2009)
        12: Poème récursif (2005)
        13: Red Example Score (2013)
        14: Red Shift Hijinks (2005)
        15: Sekka (2007)
        16: 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)

    >
```