delete from input/test, round 2.

[Graham Percival]

Here's the second round of files to remove from input/test, either by
deleting them or moving them to regression.  This might be badly timed,
since Dr. Han-Wen is probably busy celebrating now.  :)

address@hidden:~/dev/lilypond/input/test$ grep DELETE * -l
beam-damp.ly
beam-stem-test.ly
beamed-slur-endings.ly
broken.ly
diverse-spacing.ly
duration-check.ly
follow-break.ly
grace-end.ly
hymn.ly
instrument-name-mmrest.ly
key-clefs.ly
knee-sym.ly
knee.ly
ly2dvi-testpage.ly
lyric-extender.ly
lyric-hyphen.ly
lyric-phrasing.ly
lyrics.ly

I've added DELETE and/or REGRESSION to the texidoc strings, so you can
easily see them from browsing the web docs.  I think I've explained
the reasons why I proposed these files, but if not, I'm sure you'll ask.
 :)

Cheers,
- Graham