Remove some compatibility code and checks.
(widget-specify-field, widget-specify-button): Don't use XEmacs properties. (widget-overlay-inactive): Change error message. (widget-button-pressed-face): New variable. (widget-button-click): Use it. (widget-documentation-link-add): Specify mouse and button faces. (widget-echo-help-mouse, widget-stop-mouse-tracking): Functions removed now the functionality is built in.
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