Don't use cherrypy.url to build the SVG embedded URLs
cherrypy.url returns an absolute URL, not a relative one. Pretty much
everywhere else we deal in relative URLs, so ipsilon is generally
friendly to being behind a reverse proxy.
Merges: #155
Signed-off-by: Howard Johnson <merlin@merlinthp.org>
Reviewed-by: Patrick Uiterwijk <puiterwijk@redhat.com>