Ensure that Topcoll works with Moodle 2.0

When using the format with Moodle 2.0 the layout of the topics will not function due to improvements in supporting css and library functions. The topics in effect are not displayed and topic 0 is squashed.

This may change as Moodle 2.0 nears release, but the current ethos of the topic format's format.php is moving towards a non-table based format to layout the topics and therefore I summise that Topcoll will need to move forward with these improvements.