(Reuters) - California's largest community college, the City College of San Francisco, will be forced to close next year if it fails to address a raft of longstanding problems that the school blames on state budget cuts. The two-year college that serves 90,000 students risks becoming the first in California to lose its accreditation since 2006, triggering funding cuts that could shutter the school. The threatened loss of accreditation for the school, which would occur in June 2013, comes as California's heralded system of public universities and colleges groans under the pressure of reduced government funding and curtailed school budgets....