Improved SegmentPackageManager (ver) user experience.

    Red Example Score (2013) - segments - segment 01

          definition module - edit (dme)
          definition module - stub (dms)

          make module - interpret (mmi)
          make module - read only (mmro)
          make module - stub (mms)

          artifacts - version (ver)
          pdf - open (pdfo)

          versioned ly - open (vlyo)
          versioned pdf - open (vpdfo)
          versioned pdfs - open (vv)
          versioned py - open (vpyo)
          versions directory - list (vdls)

    > ver

    Will copy ...

     FROM: /Users/trevorbaca/Documents/abjad/scoremanager/scores/red_example_score/segments/segment_01/definition.py
       TO: /Users/trevorbaca/Documents/abjad/scoremanager/scores/red_example_score/segments/segment_01/versions/0000.py

     FROM: /Users/trevorbaca/Documents/abjad/scoremanager/scores/red_example_score/segments/segment_01/output.ly
       TO: /Users/trevorbaca/Documents/abjad/scoremanager/scores/red_example_score/segments/segment_01/versions/0000.ly

     FROM: /Users/trevorbaca/Documents/abjad/scoremanager/scores/red_example_score/segments/segment_01/output.pdf
       TO: /Users/trevorbaca/Documents/abjad/scoremanager/scores/red_example_score/segments/segment_01/versions/0000.pdf

    Ok? q

The function now messages what it will do before it does so.