remove obsolete comment about page maps

(cherry picked from commit bea11510645192d94b6b2c226e220b72a1364d15)
WICKET-5642 CheckingOutputObjectStream should filter duplicates by identity, not by equality

(cherry picked from commit e8e184b289a595b96d1090a6e94a97c72aa946af)
WICKET-5639 ResourceResponse does not write headers when status code is set

(cherry picked from commit c95d8f74c30a1838daa9c92208bcbe8904372957)
WICKET-5644 prevent non-Ajax submit
WICKET-5349 Wizard replace <table> markup
WICKET-5349 Palette replace <table> markup
WICKET-5643 storeBufferedResponse should check if session is temporary.

added a check for session id and some JavaDoc
Code beautifying: method WebPageRenderer.respond
WICKET-5645 throw MarkupException if no markup class is associated
WICKET-5646 allow stop search at component
WICKET-5349 SignInPanel replace <table> markup
WICKET-5647 missing generic cast causes compile error on OS X / jdk 8
WICKET-5643 storeBufferedResponse should check if session is temporary.

Code changed as suggested by Martin
WICKET-4904 improved javadoc and marked as deprecated