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