Release v1.16.0, August 2022

Minor fixes:

• Added validations to course configurations:
  • the course unprotected_paths setting may only serve files from the static directory (#14)
  • module and course dates, e.g., opening time must be earlier than closing time
• Fixed the name of the read-open field in the aplus-json output.

Release notes:
https://apluslms.github.io/releases/v1_16.html