-fixed an error in the notice dialog for downloadQueue.js that caused
buttons not to be rendered and the request indicator not to disappear on
failed downloads.
-fixed more memory leaks.  Preview controls that are subviews of layer
rows were not properly cleaned up.  
-added css class "slideVertical" to the collapsed table, so that it
moves with the advanced search box expansion/contraction.
-added some info and a bean definition (commented out) in
security-app-context.xml to support ldap authentication