Add a new configuration option : layout_header_top_height. This changes the height of the top element in the website.
Also fixe some CSS bugs when reducing the page width: some elements where not following. Their position was fixed.
Now, it is calculated according to the requested page width.



git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@31691 20353a03-c40f-0410-a6d1-a30d3c3de9de