added booking overview of all booking instances on a moodle site, displayed in the booking block
language file fixed
performance optimizations and bugfixes
fixed bug for sort options
performance optimizations
subscribe users now object oriented in subscribers.php
minor performance issue fixed
bugfix: empty array not checked for addionalfields after saving booking settings
bugfixes for booking overview of all booking instances used with the block booking
On update clears send parameter.

Conflicts:

	lib.php
Revert "On update clears send parameter."

This reverts commit 3c2290ccabf7390055c2214e3dc84e346f8834f0.
points use 2 decimals, tag settings appearance changed
event creation: if not course selected, then refer to course where booking module is placed
export of dates fixed
minor bugfixes
 Send custom message only to selected users.
export bugs fixed
fixed warning undefined variable
version updated
fixed field type of field points