Changed
- The `url_action_perform()` and `url_action_call()` JavaScript
functions are renamed to `action_perform()` and `action_call()`.
Aliases are in place for backwards-compatibility.
- Widths of images inserted into DOCX files now support centimeters
and twips as units.
- The `continue button field` can now be used with other types of
`question`s that set variables, rather than just `fields`.
Fixed
- Unpickling errors in `user_interviews()` not trapped.