Added (lyri) command.

Explanation: (lyri) replaces both the (lyrr) and (rr) commands.

Here's the segment wrangler menu. Use (lyri) to reinterpret LilyPond files for
all segments. This rpelaces the (rr) command:

    Red Example Score (2013) - segments

        1: segment 01
        2: segment 02
        3: segment 03

        all segments - current lilypond file - reinterpret (lyri)

        all segments - current pdf - make (pdfm)
        all segments - current pdf - version (pdfs)
        all segments - current pdf - view (pdfv)

        new segment (new)

    >

You can also use (lyri) to reinterpret the LilyPond for just the active
segment, too. This replaces the (lyrr) command.