[gl2ps] fix text alignment and rotation in PDF

[Dan Lipsa]

Hi all,
I would like to submit the following patch that fixes text alignment and
rotation for output to PDF.
We use this in the VTK version of gl2ps.

I had to add an extra gl2psTextOptColor function with parameters for the
bottom left corner of the text bounding box.


GL2PSDLL_API GLint gl2psTextOptColorBL(
+  const char *str, const char *fontname,
+  GLshort fontsize, GLint alignment, GLfloat angle,
+  GL2PSrgba color, GLfloat blx, GLfloat bly);


Thanks,
Dan
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