Reinstated material manager output summary menu section.

Example:

    Red Example Score (2013) - materials - instrumentation

        * hornist: horn
        * trombonist: tenor trombone
        * pianist: piano
        * percussionist: no instruments
        * violinist: violin
        * cellist: cello

       1: __init__.py
       2: __metadata__.py
       3: definition.py
       4: output.py
       5: versions/

          definition.py - autoedit (da)
          definition.py - check (dc)
          definition.py - open (do)
          definition.py - output (dp)

          output.py - check (oc)
          output.py - illustrate (oi)
          output.py - open (oo)

    >