Countrywide Results Spark Sector Selloff  NEW YORK (Reuters) - Countrywide Financial Corp. &lt;A HREF="http://www.investor.reuters.com/FullQuote.aspx?ticker=CFC.N target=/stocks/quickinfo/fullquote"&gt;CFC.N&lt;/A&gt; on  Wednesday posted a 47 percent drop in quarterly earnings and  cut its outlook as mortgage refinancings fell and interest  rates climbed, sparking a broad sell-off in mortgage-company  stocks.