Improvements to Wicketstuff Suckerfish Dropdowns

I have checked in the following minor improvements: - Changed references to Link to AbstractLink to make the implementation more general - Added a down or right arrow icon if there are children - Upgraded to Wicket 1.3.1 See https://wicket-stuff.svn.sourceforge.net/svnroot/wicket-stuff/trunk/wic

Improvements to Wicketstuff Suckerfish Dropdowns

I have checked in the following minor improvements: - Changed references to Link to AbstractLink to make the implementation more general - Added a down or right arrow icon if there are children - Upgraded to Wicket 1.3.1 See https://wicket-stuff.svn.sourceforge.net/svnroot/wicket-stuff/trunk/wic