Modified the javadoc in ExtendedProperties to redirect users to Commons Configuration for advanced needs

git-svn-id: https://svn.apache.org/repos/asf/commons/proper/collections/trunk@656318 13f79535-47bb-0310-9956-ffa450edef68

pom.xml

@@ -442,6 +442,7 @@
           <linksource>true</linksource>
           <links>
             <link>http://java.sun.com/javase/6/docs/api</link>
+            <link>http://commons.apache.org/configuration/apidocs/</link>
           </links>
         </configuration>
       </plugin>

src/java/org/apache/commons/collections/ExtendedProperties.java

@@ -43,8 +43,12 @@ import java.util.Vector;
  * to use the same key many times concatenating the value strings
  * instead of overwriting them.
  * <p>
- * <b>Please consider using the <code>PropertiesConfiguration</code> class in
- * Commons-Configuration as soon as it is released.</b>
+ * <b>Please consider using the
+ * {@link org.apache.commons.configuration.PropertiesConfiguration} class in
+ * <a href="http://commons.apache.org/configuration">Commons Configuration</a>.
+ * It's an evolution of <code>ExtendedProperties</code> supporting more
+ * features like automatic reloading, advanced interpolation, more type
+ * conversions, changes notifications and file layout preservation.</b>
  * <p>
  * The Extended Properties syntax is explained here:
  *