[gl2ps] Patches/VTK Integration

[David Lonie]

Hi list,

I've been working on the gl2ps exporter in VTK, and I've had to make a
couple of changes to the gl2ps sources. We'd like to see these merged
upstream so that VTK/ParaView will be able to link against system-wide
GL2PS installations in the future.

I've attached three diffs, each containing a change:

* color.diff
    Add option to gl2psTextOpts to explicitly set the color. We ran into
    issues on certain implementations where the GL_CURRENT_RASTER_COLOR
    wasn't preserved in feedback mode as expected (See my previous post:
    http://www.geuz.org/pipermail/gl2ps/2012/000348.html and ref'd
    http://www.groupsrv.com/computers/about128565.html ).
* getFileFormat.diff
    Adds a gl2psGetFileFormat() function to the API. This makes it easier
    to generate raw output for gl2psSpecial calls.
* gl2psSpecialPDF.diff
    Adds an implementation of the gl2psSpecial command for the PDF backend.

Please let me know if these can be merged upstream as-is, or if there
is any improvement they need.

Thanks,

Dave
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