A local group that watches public funds hopes to take its complaints over utilities rates to the polls.  The Sacramento County Taxpayers League's new ballot proposal seeks to stop a 9.2 percent city utilities rate increase scheduled to start in July.  The proposal follows a Jan. 6 grand jury report saying that the city’s use of utilities funds may conflict with Proposition 218, a state law that dictates how city funds should be used.  The grand jury report claims that money collected from residents' utility bills may have been used to fund other municipal programs. Prop. 218 states that cities can use funds from utilities bills in one way: to cover the costs of delivering utilities servi