[gl2ps] shape-rendering in svg output

[Pantxo Diribarne]

Hi,

Currently the "shape-rendering" attribute is set to "crispEdges" for the
whole group of objects. This is very useful to avoid spurious anti-alaising
lines between rendered triangles, but it also forces lines and text to be
rendered jagged.
Is there a reason to disable anti-aliasing for all shapes or could this be
limited to triangles?

I attached a simple patch that disables anti-aliasing for triangles only
(not lines, not text).

Pantxo
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