[Knobot-devel] xhtml

[<re...@gm...>]

As discossuded at the Knobot meeting, I changed the iefix-filter no
longer to change the xhtml content-type to html if the client
explicitely accepts xhtml. as a consequence the definition of those
templates which require the result to be interpreted as html (i.e. those
using tinymce) need to be redefined.