In an unusual display of police might, Mayor John F. Street and Police Commissioner Sylvester Johnson yesterday announced plans to deploy 80 additional police officers in the 12th Police District in Southwest Philadelphia. For emphasis, the officials, after inviting media coverage, conducted a roll call of 80 uniformed police officers in the parking lot of Woodland Village Plaza at 60th Street and Woodland Avenue about 4 p.m. The roll call, in which officers drilled in formation and displayed their handguns, was held "so the people of this community can see that we are serious about the problem of crime and...