Fix two issues around help-window-select. (Bug#11039) (Bug#19012)
* help.el (help-window-old-frame): New variable. (help-window-select): Default to nil (Bug#11039). Rewrite doc-string. (help-window-setup): When the help window appears on another frame and `help-window-select' is non-nil, give that frame input focus too (Bug#19012). (with-help-window): Store selected frame in help-window-old-frame.
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