Fixes to make webreference.com menus show up.  This involved
	fixing layers to not clip positioned objects when overflow:hidden
	is set, fixing the stupid clip/sync layout hack for livepage
	so that it doesn't break webreference, and implementing
	navigator.productSub (right now the date is set to
	Christmas 2002).

        Reviewed by gramps/maciej.

        * khtml/ecma/kjs_navigator.cpp:
        (Navigator::getValueProperty):
        * khtml/ecma/kjs_navigator.h:
        * khtml/ecma/kjs_navigator.lut.h:
        * khtml/rendering/render_box.cpp:
        (RenderBox::getOverflowClipRect):
        * khtml/rendering/render_box.h:
        * khtml/rendering/render_flow.cpp:
        (RenderFlow::layout):
        * khtml/rendering/render_layer.cpp:
        (RenderLayer::paint):
        (RenderLayer::nodeAtPoint):
        (RenderLayer::constructZTree):
        * khtml/rendering/render_layer.h:
        * khtml/rendering/render_object.cpp:
        (RenderObject::setLayouted):
        * khtml/rendering/render_object.h:


git-svn-id: http://svn.webkit.org/repository/webkit/trunk@3054 268f45cc-cd09-0410-ab3c-d52691b4dbfc