[PATCH] xdoc copyright fix + a footer

[Martin van den Bemt <ml...@mvdb.net>]

Hi all,

Here is a patch to fix the copyright under the menu in navigation.
I also added a footer tag (and adjusted documentation) , so you can have
additional html below the menu and above the copyright notice. 
I use it mainly for a sourceforge logo (which is provided in the example
in the docs).

Have fun..

Mvgr,
Martin