Allow for different prices per team

At the moment, you can specify just one set of costs for a league (ie, the full price, cost per round prices etc).  In some cases it would be useful to have a different cost for different teams (SUNDAY PRICE, PREPAID Price, Student Discount etc).  Probably something like a SET of prices that are configurable at the league level, and then a cost type is selected when the team is added to the league, and one of them is  chosen as the DEFAULT cost price which is assigned to teams who register online.