PBL UOL

I have been working on the PBL units of learning for Chris Beaumont. The idea was that students would work in teams, and use role properties to share work. I had wanted to use create-new to define a new role for each team. However, this doesn't seem to be handled very well in SLeD, and so I have set up a run for each team. This is OK as long as teams don't need to collaborate with each other.