CENTERVILLE — The St. Mary Parish School Board took a stand on two state issues Thursday. Both issues could affect the public schools budget. The board passed one resolution opposing the current move to centralize sales tax collections at the state level. The other resolution supports an increase in the state Minimum Foundation Program formula, the major source of state aid to local schools. The sales tax centralization measure getting the most publicity is House Bill 57 by state Rep. Tanner Magee, R-Houma. It’s a proposed state constitutional amendment that would require approval by the Legislature and Louisiana voters. If it passes,