Prot# 440E-ONC-0047-140: Phz I Dose-Escalation Study to Eval. Max Tolerated Dose, Safety Profile & Bioavailability of Semi-Solid Matrix (SSM) Capsule Formulation of Orally Admin'd Irinotecan Hydrochloride (CPT-11) Given Alone or in Sequence w/ Orally Admi