Avoid using input names that conflict with any DOM API names.

Using input names that conflict with DOM API method and attribute names
interferes with JavaScript ability to use DOM API on the form element.

(cherry picked from commit b82e1cab704e5a7a32df580bae48421deea69fac)

Conflicts:
	wicket-core/src/test/java/org/apache/wicket/ajax/form/AjaxFormSubmitTestPage_expected.html
	wicket-core/src/test/java/org/apache/wicket/markup/html/form/CheckBoxMultipleChoiceTest.java
	wicket-core/src/test/java/org/apache/wicket/markup/html/form/RadioChoiceTest.java