Possible 4.2 release branch bug fix

[Daniel J S. <dan...@ie...>]

I placed a simple patch on SourceForge to fix a bug from a change on 2007-02-25 
in which setup_tics() was moved from inside the colorbox routine to plot3d.c. 
The oversight is that graphics.c also needs such a call if the routine is 
removed from colorbox draw.  (This is a case where some unification of 2D/3D 
layout similarities would have obviated such oversights.)

Please consider moving that bug fix into the 4.2 branch updates if that is what 
is being done for 4.2.

Dan