fixing broken weblinks

[Pedro Kröger]

Hi,

I started fixing some broken weblinks (using the 404 report) but
some things are not clear to me:

- how is something like this supposed to be fixed:

   40 /doc/v2.6/Documentation/user/lilypond/lily-32998009.png
        
http://www.organy.com.pl/forum/viewtopic.php?t=33&start=45&sid=7aa472a37a7cf6c57feb934536bc2f7b

  where the png file changes from time to time

- how to fix the documentation for older versions? I suppose I should
fix the files at the cvs branches (like lilypond_2_6 and so on).

Cheers,

Pedro