for groups. In the process, added some select_related/prefetch_related
code to cut the number of database queries in the agenda down from
4000-5000 to about 50. Rewritten agenda CSV code to use Python arrays
rather than a template for improved readability/reuse. Rewritten week
view to assemble its data in Python. Plus a few other minor cleanups,
e.g. lame_description is now gone.
Fixes#1088. Branch ready for merge.
- Legacy-Id: 9669
