Git commits in Moodle 2.1.0 by Mark Johnson

commit c78f8443e6535b29bd5a0fe401c4720103d1f143
Author: Mark Johnson <mark.johnson@tauntons.ac.uk>
Date:   Fri, 24 Jun 2011 20:25:28 +0800
Tag:    v2.1.0

MDL-28025 pagelib improve error message when $PAGE->context isn't set