Hashish v. Gonzales, 442 F.3d 572 (7th Cir. Mar. 24, 2006) (timely request for pre-conclusion voluntary departure not alone sufficient to avoid stricter requirements of post-conclusion voluntary departure; other requirements of 8 U.S.C. 1240.26(b)(1)(i), including waiver of removal offenses or relief, must also be met).