[changeset] suppress unexpected shift in eps image by gnuplot

[Ben Abbott]

I found a problem with eps output (via gnuplot), and pushed a  
changeset that empirically suppresses the problem.

changeset:   8901:821f0242e8c1
tag:         tip
user:        Ben Abbott <bpabbott at mac.com>
date:        Tue Mar 03 00:45:00 2009 -0500
summary:     gnuplot_drawnow.m: Fix unintended shift of plot image for  
the gnuplot postscript+eps terminal.

The eps image was shifted unexpectedly (left margin larger and right  
margin smaller).

A bug report has been filed for gnuplot.

https://sourceforge.net/tracker2/?func=detail&aid=2656342&group_id=2055&atid=102055

I've verified this works with gnuplot 4.3.x (present developers  
sources) and 4.2.3.

Ben