We didn't catch Channel 7's 5 p.m. newscast, but two alert readers tipped us off to the station's new graphics package, a new sans-serif font in an obtrusive white and red stripe that consumes nearly a quarter of the screen. (We were able to see it on the 6 p.m. cast.) The new look is incorporated into the entire program, and isn't, at first blush, all that impressive. The unveiling comes on the