[Htmlunit-user] HtmlCheckBoxInput.click() onclick logic

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The function com.gargoylesoftware.htmlunit.html.HtmlCheckBoxInput.click() does 
not handle the onclick event handler correctly.  When a onclick handler is 
specified on a HTML checkbox that causes a new page to be displayed, the 
function HtmlCheckBoxInput.click() does not return the new page.  Rather it 
returns the original page.  Note that the actual function is on the base class 
ClickableElement.  The attached patch fixes the problem.

Note that the patch may break code that is relying on ClickableElement.click() 
to return the return value of doClickAction().  However, I could not think of 
senario where one would want that behavior.  Perhaps someone with more 
experience with the code can spot a problem.

Mike Bresnahan