Aging punk fans with a little gray in their mohawks had a short, fast embarrassment of riches when two of punk rock's early legends played on opposite sides of Austin on Wednesday night at SXSW. First, Austin punk-rock forebears the Dicks hit the stage at 27th Annual Austin Music Awards, accepting a lifetime achievement award for their unique, soulful brand of aggression. The Dicks helped invent Texas punk in 1980, leaving an