Slamdance has unveiled its Special Screenings, Beyond and Shorts programs for the 23rd edition of its festival, which will include 35 world premieres, nine North American premieres and 10 U.S. premieres within the programs. Three films feature in the Special Screenings program including fest alumni Cullen Hoback's investigative documentary What Lies Upstream, which serves as opening night film, while further screenings include doc You Never Had It: An Evening With Bukowski…