Shortened Red Example Score build file names.

Example:

    Red Example Score (2013) - build files

       1: back-cover.pdf
       2: back-cover.tex
       3: draft.pdf
       4: draft.tex
       5: front-cover.pdf
       6: front-cover.tex
       7: music.ly
       8: music.pdf
       9: preface.pdf
      10: preface.tex
      11: score.pdf
      12: score.tex
      13: segment-01.ly
      14: segment-02.ly
      15: segment-03.ly

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

          segment lys - copy (lycp)
          segment pdfs - copy (pdfcp)

    >

The shorter file names shown here are recommended. The previous (longer) names
like score-back-cover.pdf and score-preface.pdf are not necessary.