in the content of questions, use .SELF. references which should point to images stored underneath the question itself. Show that when the questions are used inside of exams, the .SELF. reference will currently not be resolved to the question and result in an unresolved link.
added a test for checking the results of the preview of test-items
Since the preview workflow requires a multiple redirects, xowiki::test::edit_form_page requires a new flag refetch to actually turn off automatic refetching of the result page, since this does not give us access to the redirect location returned by the edit command.