Implement a CSRF token to protect a little more against CSRF attack.
Enhance the UI framework to allow opening a link in a new browser
window.

Enhance variables of daily bulk notification, implements send
notifications just after assignments

Implement an upgrader which delete unused course /export/* directory or
download ZIPs like imscp.zip, blog.zip, podcast.zip which not unused or
only temporary

Show an error message if AC doesn't respond to the simplest call to
create a breeze session.

duration