[PATCH] Add -ddumb device to print.

[Rüdiger Sonderfeld]

Hello,
this patchset adds a "-ddumb" device to print for gnuplot.  The device prints 
the plot as ascii art.  "dumb" is already supported as device in drawnow.  The 
main use case for "dumb" in print right now would be info manual output.  
Currently the plots in the documentation are only included in a graphical 
version which is not supported by terminal info viewers.  With this patch the 
documentation could include an ascii art version of the plots.

One problem remains: There should be a way to specify the size of the plot in 
characters.  Right now the patch adds a fixed size (drawnow as default uses 
COLUMNS/ROWS value for the existing terminal).  Using -S to pass the 
information seems like a bad idea because -S usually expects size in pixel.

The second part of the patch changes some of the doc plot generators to use "-
ddumb".  But the generated plots are a bit too large right now (72x24) and can 
cause issues in Emacs info mode and the standalone info viewer.

Regards,
Rüdiger

print-patch.patch
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