Events chain doesn't finish when event handler returns false (patch provided)

[diego]

At ​http://docs.elgg.org/wiki/Events says that when an event handler returns false it would halt the event chain.

However it doesn't happen because all the event handlers are called despite their return value:

elgglib.php 1355-1357

if ($eventfunction($event, $object_type, $object) === false) {
   $return = false;
}

The provided patch fix this problem halting the event chain when the eventhandler function returns false

[marcus]

(In [svn:2516]) Closes #628: Event change now terminates on false. Nice spot :)

[marcus]

(In [svn:2530]) Fixes #655, Refs #628: Install now working with correct event chain (#628).