Lennar Profit Up 12 Pct, Shares Fall  CHICAGO (Reuters) - Home builder Lennar Corp. &lt;A HREF="http://www.investor.reuters.com/FullQuote.aspx?ticker=LEN.N target=/stocks/quickinfo/fullquote"&gt;LEN.N&lt;/A&gt; on  Monday reported a 12 percent rise in quarterly profit and  raised its forecasts for the current and following year, citing  a stable economy.