Sadler's Wells East, LondonThe all-male French troupe Chicos Mambo mix parody and pointework in a fast-paced comic celebration of dance's high art and sillier side When the curtain goes up here in east London, just across town there's another opening night: fans gathering to worship the late dance theatre icon Pina Bausch, whose Sweet Mambo is at Sadler's Wells. Whereas on this stage, six men send up Bausch's choreog…