Pictures of Western Washington Mental Hospital show an old-fashioned factory-sized institution, right out of the movie melodrama, The Snake Pit.  Seattle-based Associated Press investigative reporter Martha Bellisle says years of problems at the state’s largest mental hospital suggest the resemblance is more than skin-deep.  Dangerous inmates have escaped; needy inmates have been neglected; and relations between hospital management and staff, especially staff who work everyday with patients, could hardly be worse.