Patch #1393181 Change default colorbox size

[Ethan A M. <merritt@u.washington.edu>]

Mike:

I just had occasion to use your patch in preparing a plot,
since I ran up against the fact that the current parsing code for 
"set colorbox user orig <pos1>  size <pos2>"
only accepts screen coordinates for <pos>.

Your patch saved me in this case, but I think the restriction
to use screen coordinates should be removed for 2D plots.
Since you've been looking at this code recently, would
you care to modify it to remove this restriction?
That way the user can easily tweak the place using, e.g.
	set colorbox user orig 1.1 graph, 0.0 graph
	set colorbox user size 0.2 graph, 0.8 graph

If not, I'll put in on my list of future code-tweaks.

-- 
Ethan A Merritt
Biomolecular Structure Center
University of Washington, Seattle 98195-7742