fact checking for manual

[Graham Percival]

Could somebody take a look at the following three sections?

4.7: talks about lilypond-latex and using the "old" wrapper that uses 
latex, unlike current LilyPond.  Is that info correct, or should it be 
commented out until 3.0 arrives?  (I've changed "3.0" to "2.4" in the 
text, but otherwise left it alone)

7.5.8: I've tried to clarify the different ways of setting papersize, 
but I'm not certain that I understand how \layout works.  Is the new 
doc correct?   (you'll need to make web to see these changes)

9.7: do these recommended filename extensions look ok?


Thanks,
- Graham