This is a bugfix release, addressing issues for the 2nd notebook example and testing the WebUI.

[1] Features:

[2] Bug Fixes:
- Fix hashmap free issue preventing second example from working.
- Add error message when users try to import Tuplex but it is not compiled. Allows to use helper functions without having to have Tuplex compiled,
- Improve WebUI testing and error reporting

[3] Credits:
Leonhard Spiegelberg