In a city that has a reputation for being home to more dogs than children, the number of families planning to move out of San Francisco has decreased in recent years -- and on Thursday Mayor Gavin Newsom said he hopes to be able to reverse the trend of family flight. The population of children living in the city has dropped by more than 33 percent since 1960, and today there are just 112,000 young people under the age of 18 living in San Francisco, Newsom said. But the mayor painted an optimistic picture of what the future will look...