Windows pause behaviour

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> Modified files:
> 	./: ChangeLog 
> 	gnuplot/src/: command.c 
> 
> Log message:
> 	On Windows, wait for Enter in console instead for a mouse click in a special
> 	window if the graph window is not (yet) present.

Ahem --- are you aware that the console window itself wouldn't be 
displayed at all, in a non-interactive session?  What good can a  "Press 
Enter" prompt in an invisible window do us?