Candidates Clash Over Campaign Finance
Michael R Bloomberg accuses Mark Green of failing to disclose campaign finance information and suggests Green was behind publication of 1998 deposition in which Bloomberg said he would need 'unimpeachable third-party witness' to believe allegation of rape at his company; Bloomberg does not deny making that statement but says that in general, he does not believe women need witnesses to be believed when making rape charge; billionaire Republican grows testy when reporters ask about his own level of openness and his refusal to release his tax returns like other mayoral candidates; Green wins support of Roberto Ramirez, Bronx Democatic leader; photos (M)