Implemented 'views - autoedit' (vae).

The command affords view creation, modification, removal and renames. The
underlying implementation relies on the new DictionaryAutoeditor.

Example:

    Abjad IDE - scores

       1: Aracılık (2014)
       2: Betörung (2012)
       3: Blue Example Score (2013)
       4: Čáry (2006)
       5: Chrysanthemums (1995)
       6: Étude Example Score (2013)
       7: Gebiete (2013)
       8: L'archipel du corps (2011)
       9: Las manos mágicas
      10: Lidércfény (2008)
      11: L'imaginare (2010)
      12: Manifolds (2013)
      13: Mon seul désir (2009)
      14: Poème récursif (2005)
      15: Red Example Score (2013)
      16: Red Shift Hijinks (2005)
      17: Sekka (2007)
      18: Tack (1996)
      19: Territoires
      20: Traiettorie inargentate (2013)
      21: Zeit (1998)

          scores - copy (cp)
          scores - new (new)
          scores - remove (rm)
          scores - rename (ren)

    > vae

    Abjad IDE - scores - views (EDIT)

       1: bača: [not md:is_example]
       2: cary & sekka: [Čáry (2006)]
       3: examples: [md:is_example]

          elements - add (add)
          elements - move (mv)
          elements - remove (rm)
          elements - rename (ren)

          done (done)

    > add
    Enter dictionary key> cherry scores

    Abjad IDE - scores - views (EDIT)

          elements - add (add)

          done (done)

    > add
    Element> md:is_flavor == 'cherry'

    Abjad IDE - scores - views (EDIT)

       1: md:is_flavor == 'cherry'

          elements - add (add)
          elements - remove (rm)

          done (done)

    > done

    Abjad IDE - scores - views (EDIT)

       1: bača: [not md:is_example]
       2: cary & sekka: [Čáry (2006)]
       3: examples: [md:is_example]
       4: cherry scores: [md:is_flavor == 'cherry']

          elements - add (add)
          elements - move (mv)
          elements - remove (rm)
          elements - rename (ren)

          done (done)

    > done
    View inventory written to disk.

    Abjad IDE - scores

       1: Aracılık (2014)
       2: Betörung (2012)
       3: Blue Example Score (2013)
       4: Čáry (2006)
       5: Chrysanthemums (1995)
       6: Étude Example Score (2013)
       7: Gebiete (2013)
       8: L'archipel du corps (2011)
       9: Las manos mágicas
      10: Lidércfény (2008)
      11: L'imaginare (2010)
      12: Manifolds (2013)
      13: Mon seul désir (2009)
      14: Poème récursif (2005)
      15: Red Example Score (2013)
      16: Red Shift Hijinks (2005)
      17: Sekka (2007)
      18: Tack (1996)
      19: Territoires
      20: Traiettorie inargentate (2013)
      21: Zeit (1998)

          scores - copy (cp)
          scores - new (new)
          scores - remove (rm)
          scores - rename (ren)

>