First set of changes for proj head and all group roots in the group to get
mail instead of just the proj head. So far, the only mail that really does it is the swap requests, but others are coming soon, especially new user application mail and the like. Also clarified some of the documentation about students starting projects. New project page says they can't, and that their advisor has to do it, then links to auth.html, which says they can with prior special permission. Hopefully we won't get too many more students making project apps and messing things up.