When scanning system drives for installed SDKs, default SDK version to 5.0 when no SDK version info is available; also updated SDK properties dialog to correctly display SDK version string.

<?xml version="1.0" encoding="UTF-8"?>
<?eclipse version="3.0"?>

<!--
/**
 * <copyright>
 * </copyright>
 *
 * $Id$
 */
-->

<plugin>

   
</plugin>