Fix webtests

Three issues were found:

 - The JVM stack size was too low when running locally, resulting in stack overflows (this didn't happen in Decimate).
 - Mozilla Rhino just explodes when it hits the `onchange` attribute used in the ctype form.
 - WebTests can produce pages with a \'\ in the title, which resulted in bad link HTML when the `SvnWikiLinkPartHandler` rendered the attributes with single quotes.