The three schools in the county that were closed for swine flu are going to reopen tomorrow, on the basis of revised guidelines from the federal Centers for Disease Control and county health officials. Children and teachers are supposed to come back as long as, you know, they don’t seem to have swine flu. The reopenings also avert a potentially sticky situation in San Diego Unified, where the teachers union had argued that employees should not have to come back to work while the schools were closed.