Page History

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This method was needed as a workaround for some old version of Firefox that had an issue with rendering images.
The flush of the headers caused problems with proper buffering of the response, e.g. when the response needs to be compressed.

All IXyzSettings are removed WICKET-5410

All interfaces related to configuration settings have been removed because the user application usually call setter methods like application.getXyzSettings().setAbc(abc) and don't provide their own implementations of these interfaces.
Additionally by using interfaces it is not possible to add new settings in a minor release of Wicket because it is considered as an API break.

Behavior changes

org.apache.wicket.request.Url#getQueryString WICKET-4664

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