The funniest movie we've seen all summer, the British political satire In the Loop, arrives Friday at The Belcourt as part of the historic Hillsboro Village theater's "Best of Sundance '09" series. What could be better than watching sharp-tongued hatchet men flay each other with some of the most explosively profane bluster since Nixon left office? Why, a free reception before the 7 p.m. show Friday night, featuring food from Sunset Grill, Midtown Cafe, Cabana, Fido and Tin Angel with a selec