Added the individual png files to EXTRA_DIST instead of the icons directory. This way the .svn directories do not get in the tarball. An alternative solution would be to delete these in a dist-hook target.
2 Title: LEMON Reference Manual
3 Author: LEMON Development Team
4 Abstract: Documentation of LEMON.
8 Index: /usr/share/doc/lemon/html/index.html
9 Files: /usr/share/doc/lemon/html/*.html