Newsday Replaces Top Editor  NEW YORK (Reuters) - Tribune Co.'s &lt;A HREF="http://www.investor.reuters.com/FullQuote.aspx?ticker=TRB.N target=/stocks/quickinfo/fullquote"&gt;TRB.N&lt;/A&gt; Newsday  newspaper, which got a new publisher in July after a  circulation scandal, on Tuesday replaced its top editor, Howard  Schneider, who was in the job for about a year.