[gl2ps] Color in new postscript viewports

[Pantxo Diribarne]

Hi,

We identified a bug in gl2ps, from a bug in Octave [1], which is solved 
by the attached path.
Basically gl2ps changes the current color in poscript terminal if the 
color of the current object is different from the previous one. The 
problem is that after initialization of a new viewport, the current 
color is white, regardless of the last object color.

Thanks,

Pantxo

[1] http://savannah.gnu.org/bugs/?48148
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