New left-side navigation. Some links have been commented out (FAQ, Tasks, Modules, Bindings). They are alreay accesib...

Original commit message from CVS:
* HACKING:
* TODO:
* src/copy/gstreamer.css:
* src/htdocs/dev/index.xml:
* src/htdocs/header.xml:
* src/htdocs/header.xsl:
* src/htdocs/index.xsl:
* src/htdocs/news/news.xsl:
* src/htdocs/page.xsl:
New left-side navigation. Some links have been commented out
(FAQ, Tasks, Modules, Bindings). They are alreay accesible from the
subpages and the tasks are outdated. The remaining links have been
visually grouped. Table-layout on the front-page has been fixed. Irc
link on devel page reworded and modules linked from the page.