Fix for problems with newer versions of deform

Fix for issue #14.

Change richtext.pt template to reflect latest changes in deform, as our old template caused JS errors with newest
versions of deform.

This requires a newer version of deform and won't work without it (it's pinned in setup) - backwards compatibility wasn't added because I'm guessing we will be updating Kotti to a newer deform version soon anyway because of translation fixes (we're using trunk versions of both and it works well).