gnuplot plotting front-end and octave 2.9.18

[David Bateman]

Ok, the attached patch address, all of the remarks you made, except this
one.

>> * Compare these plots with a grid added in M. and in Octave:
>>      x=0:1:10000; y=sin(x); plot(x,y); grid
>>      imagesc(1./hilb(18)); grid
>>   The former one has the grid below the plot, the latter above.
>>   In Octave, both are below.
>>   Therefore the image() command should contain
>>      reset ... ; set grid front; unset grid
>>   so that the "g" hotkey also places the grid above the surface,
>>   and the grid() command should also specify
>>     set grid front
>>
> 
> I'm not quite sure I under stand this one. Can you offer a patch?
> 

and the colorbar comment that I don't think we can do anything about
without horrid kludges... I checked the patch against gnuplot 4.0 and
4.2.2 and the only command that causes issues for 4.0 is "set border
front" which is limited to the use of gnuplot for images and so is only
used with gnuplot 4.2 or later and so shouldn't be an issue.

D.
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