#480 setChecked should return Page

[Jean-Baptiste Nizet]

The setChecked method of HtmlRadioButtonInput triggers the onchange event, but the page returned by the event handling is not returned by the method. Hence, if I submit the form in the onchange event, I can't get the resulting page.
The setChecked method should return a Page. This is true for other inputs as well (HtmlCheckBoxInput, etc.)

[Ahmed Ashour]

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Done in SVN, many thanks.