Stocks Up on Sears Deal, But Gains Lag   NEW YORK (Reuters) - Stocks rose on Wednesday after news  of an \$11.5 billion retailing deal and solid earnings from  computer maker Hewlett-Packard Co. &lt;A HREF="http://www.investor.reuters.com/FullQuote.aspx?ticker=HPQ.N target=/stocks/quickinfo/fullquote"&gt;HPQ.N&lt;/A&gt;, but a rise in oil  prices caused stocks to trim gains.