Labor Costs, Hurricane Hit Alcoa Profit  NEW YORK (Reuters) -  Alcoa Inc. &lt;A HREF="http://www.investor.reuters.com/FullQuote.aspx?ticker=AA.N target=/stocks/quickinfo/fullquote"&gt;AA.N&lt;/A&gt;, the world's  biggest aluminum producer, said on Thursday that net income for  the quarter rose slightly, as labor problems and the effect of  Hurricane Ivan offset high aluminum prices.