It’s day two of the BART strike, and commuters across San Francisco are not happy. From the Mission District to the Embarcadero, children, teenagers and adults squeezed onto overcrowded buses, hailed cabs, made phone calls to jobs and loved ones to say they’d be late, and stood in long lines for AC Transit buses and ferries headed across the Bay. “It’s a huge inconvenience for everybody,” said Joe Guthrie, of the East Bay, as he rode the 14L bus to…