The state Board of Education has voted to advance the opening of a new charter school in Danbury, the first in the City. The Danbury Prospect Charter School can only open though if funding is provided by the state General Assembly.   Plans call for having 110 sixth-graders, adding on each year until it is a 6th-through-12th grade college preparatory school.  The Brooklyn Prospect Charter School, which operates four charter schools in New York, is the model for the Danbury proposal.  There is no proposed location for the school, but operators say they are looking in the downtown area. The state currently funds 23 charter schools.  Danbury School Superintendent Sal Pascarella wrote to the state Board of Ed asking for assurances the new charter will result in no costs to the district. Bethel Superintendent Christine Carver questioned if a new charter school should considered given the state’s financial strains.