Git merges in Moodle 1.9.13 by Petr Skoda

commit fdee5d95b732f625666eb6d3334afe4fb54ed936
Author: Petr Skoda <commits@skodak.org>
Date:   Mon, 25 Jul 2011 22:40:56 +0800
Tag:    v1.9.13

Merge branch 'MDL-27717_MOODLE_19_STABLE' into MOODLE_19_STABLE