WICKET-5523 Ajax indicator not working when display is set to none in css

(cherry picked from commit 3c01c731d52d8ec8b5d25160968ce758208b4543)
WICKET-5506 DefaultPropertyResolver should resolve the Property according to the getter first

(cherry picked from commit 5fdc484c358ae70b01d4bc445fd1d6ce41513718)
Fix generics for Java 6
WICKET-5520 improve reusability of DataTable and AbstractPageableView

(cherry picked from commit c551431720a1627b6876909a72d685c7708feb7a)