The 21st Austin Gay and Lesbian International Film Festival kicks off today with a slew of great films, and a sure-to-be-awesome opening night afterparty at Oilcan Harry's. aGLIFF is the oldest and largest gay and lesbian film festival in the Southwest, and this year's program contains more than 120 films from 17 countries (including some award-winning drama, documentary, comedy and horror features). The festival really gets going tonight with an Austinist-sponsored screening of Otto; or, Up With Dead People, a zombie flick with a twist....