Added material (dc*), (do*) and (dp*) commands.

Description: use 'all packages - definition.py - check' (dc*) to make sure the
definition.py file of every visible package interprets without error.

Description: use 'all packages - definition.py - open' (do*) to open the
definition.py file of every visible package.

Description: use 'all packages - definition.py - output' (dp*) to output the
definition.py of every visible package as output.py.

Example:

    Red Example Score (2013) - materials

       1: instrumentation
       2: magic numbers
       3: pitch range inventory
       4: tempo inventory
       5: time signatures

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

    > dc*
    Will check ...
        /Users/trevorbaca/Documents/abjad/scoremanager/scores/red_example_score/materials/instrumentation/definition.py
        /Users/trevorbaca/Documents/abjad/scoremanager/scores/red_example_score/materials/magic_numbers/definition.py
        /Users/trevorbaca/Documents/abjad/scoremanager/scores/red_example_score/materials/pitch_range_inventory/definition.py
        /Users/trevorbaca/Documents/abjad/scoremanager/scores/red_example_score/materials/tempo_inventory/definition.py
        /Users/trevorbaca/Documents/abjad/scoremanager/scores/red_example_score/materials/time_signatures/definition.py
    Ok? y
    /Users/trevorbaca/Documents/abjad/scoremanager/scores/red_example_score/materials/instrumentation/definition.py OK.
    /Users/trevorbaca/Documents/abjad/scoremanager/scores/red_example_score/materials/magic_numbers/definition.py OK.
    /Users/trevorbaca/Documents/abjad/scoremanager/scores/red_example_score/materials/pitch_range_inventory/definition.py OK.
    /Users/trevorbaca/Documents/abjad/scoremanager/scores/red_example_score/materials/tempo_inventory/definition.py OK.
    /Users/trevorbaca/Documents/abjad/scoremanager/scores/red_example_score/materials/time_signatures/definition.py OK.

    >

Example:

    Red Example Score (2013) - materials

       1: instrumentation
       2: magic numbers
       3: pitch range inventory
       4: tempo inventory
       5: time signatures

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

    > do*
    Will open ...
       /Users/trevorbaca/Documents/abjad/scoremanager/scores/red_example_score/materials/instrumentation/definition.py
       /Users/trevorbaca/Documents/abjad/scoremanager/scores/red_example_score/materials/magic_numbers/definition.py
       /Users/trevorbaca/Documents/abjad/scoremanager/scores/red_example_score/materials/pitch_range_inventory/definition.py
       /Users/trevorbaca/Documents/abjad/scoremanager/scores/red_example_score/materials/tempo_inventory/definition.py
       /Users/trevorbaca/Documents/abjad/scoremanager/scores/red_example_score/materials/time_signatures/definition.py
    Ok? y
    5 files to edit

    >

Example:

    Red Example Score (2013) - materials

       1: instrumentation
       2: magic numbers
       3: pitch range inventory
       4: tempo inventory
       5: time signatures

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

    > dp*
    Will output ...
      INPUT: /Users/trevorbaca/Documents/abjad/scoremanager/scores/red_example_score/materials/instrumentation/definition.py
     OUTPUT: /Users/trevorbaca/Documents/abjad/scoremanager/scores/red_example_score/materials/instrumentation/output.py
      INPUT: /Users/trevorbaca/Documents/abjad/scoremanager/scores/red_example_score/materials/magic_numbers/definition.py
     OUTPUT: /Users/trevorbaca/Documents/abjad/scoremanager/scores/red_example_score/materials/magic_numbers/output.py
      INPUT: /Users/trevorbaca/Documents/abjad/scoremanager/scores/red_example_score/materials/pitch_range_inventory/definition.py
     OUTPUT: /Users/trevorbaca/Documents/abjad/scoremanager/scores/red_example_score/materials/pitch_range_inventory/output.py
      INPUT: /Users/trevorbaca/Documents/abjad/scoremanager/scores/red_example_score/materials/tempo_inventory/definition.py
     OUTPUT: /Users/trevorbaca/Documents/abjad/scoremanager/scores/red_example_score/materials/tempo_inventory/output.py
      INPUT: /Users/trevorbaca/Documents/abjad/scoremanager/scores/red_example_score/materials/time_signatures/definition.py
     OUTPUT: /Users/trevorbaca/Documents/abjad/scoremanager/scores/red_example_score/materials/time_signatures/output.py
    Ok? y

    >