Jennifer SilverbergAna Jennings with DP director Joan Lipkin."If I was able to break into entertainment, I'd change people's attitudes," says Ana Jennings, an actress in the DisAbility Project, the subject of this week's RFT feature story. "I'm a pretty good singer. I do comedy pretty well. I've been told by audience members that I have good timing. I'd like to do what I do with DP on a grander scale."Unfortunately for Jennings, there aren't many disabled characters onstage, and many of those