Sadler's Wells; Paul Hamlyn Hall, Royal Opera House, LondonAthletes and dancers meet each other halfway in Rachid Ouramdane's latest. And Pam Tanowitz taps into Covent Garden's past while reaching out to the future It's a rule of life that dancers can do anything with their bodies. In Rachid Ouramdane's new work, Outsider, made with the Ballet du Grand Théâtre de Genève, they slide across the stage like oil, tum…