[gl2ps] Blending/transparency support

[Pantxo Diribarne]

Hi,

I see there are a few words of caution in the documentation about blending
and transparency. As we want to enable blending in Octave, I'd like to know
what is the status of blending in gl2ps. In particular those two

>>" Transparency is only supported for PDF and SVG output. "

AFAICS from the output of gl2psTest, transparency doesn't work for PDF
output. As for svg, transparency seams to be enabled whatever the state of
GL_BLEND. Are those known issues?

>> "*GL2PS_BLEND:*Emulates the GL_BLEND functionality. (Warning: this might
change in future releases.)"

What might change?

Pantxo
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