(1) formal location

If you import our html widgets (formal), you have to fix the import
location.  Former gavo.imp.formal is now gavo.formal.

(2) customDF -- to get the request object out of the context, you cannot
do inevow.IRequest(ctx) any longer.  Use ctx.request instead.


TODO:

* service.SvcResult sollte wahrscheinlich verschwinden.

* widget.FileUploadRaw, FileUpload, and FileUploadWidget brauchen
  noch eubeb resource manager und damit den context.  Reparieren oder
  wegmachen.