Docassemble

Added
- Configuration directive `allow demo` for allowing demonstration
interviews in production mode.
- Ability to send e-mail using the Mailgun API instead of SMTP.
- The `decimal places` option for automatically formatting floating
point numbers passed to DOCX and PDF forms using `field code`,
`code`, or `field variables`.
Changed
- If the `checkin interval` configuration directive is set to `0`, the
browser will not "check in" at all.
- When the `/api/session/question` API encounters an undefined
variable for which a definition is not available, it will no longer
return an error code, but will return a success code and indicate
what variable was not defined.
Fixed
- Invalid HTML in navigation bar.
- Removed unnecessary invalidation of interview cache.
- Problem with address autocomplete when variable name contains a bracket.

Added
- The `get_chat_log()` function.
- An API interface.
- Administrative functions.
Fixed
- Result of `user_interviews()` was reporting the wrong `utc_modtime`.
- Error with `google maps api key` when an `api key` alone was set under
`google` in the Configuration.
- Problem with formatting of chat log after going back into a session.

Added
- The `send_fax()` function for sending faxes using Twilio.
- The `include_docx_template()` function for including .docx content
within a .docx file.

Added
- Ability to run `interview_list()` on all users. Additional keys
`user_id` and `email` are included in results.
- Integrated the Place Autocomplete feature from the Google Places API.
Fixed
- Bug in YAML parser triggered sometimes by fields with blank labels.
- Newline to space error in docx templates that affected Word but not LibreOffice.

Added
- The `user` and `environment` datatypes.
Fixed
- Typo in HTML when `camera` and other HTML5 upload datatypes were used.

Changed
- Better features in background actions for handling exceptions.
Added
- The `background_error_action()` function.