make web broken; henle-flat stuff

[Graham Percival]

Attempting to make web fails here.  The @xref warning is old and doesn't
really matter, but the @image file stuff happened recently.


LANG= makeinfo  --enable-encoding -I./out-www  
--output=out-www/lilypond.html  
--css-include=/Users/gperciva/usr/src/lilypond-cvs/Documentation/ 
texinfo.css --html --no-split --no-headers out-www/lilypond.texi
/Users/gperciva/usr/src/lilypond-cvs/Documentation/user/out-www// 
introduction.texi:64: @image file `henle-flat-gray.gif' (for HTML) not  
readable: No such file or directory.
/Users/gperciva/usr/src/lilypond-cvs/Documentation/user/out-www// 
introduction.texi:72: @image file `baer-flat-gray.gif' (for HTML) not  
readable: No such file or directory.
/Users/gperciva/usr/src/lilypond-cvs/Documentation/user/out-www// 
lilypond-book.texi:385: warning: `.' or `,' must follow @xref, not `f'.
makeinfo: Removing output file `out-www/lilypond.html' due to errors;  
use --force to preserve.
make[3]: *** [out-www/lilypond.html] Error 1