A minor update, 4.2.1

A minor update to our 4.2.0 will be available today (tomorrow tops) in the App store.

- textDrop in the seating plan should now work as expected
- Changed security requirements for WebDAV servers
- Text notes being cancelled did not reset its configuration
- Custom lists in spinning wheel could not be erased
- Improved cell edition in gradebook
- Formula: Improved RAW function with empty cells
- Formula: New MODULO function

Again, please do not forget to update your review for this version. We depend on it!