cast toff_t to std::streamoff
remove 'C' style comments!!
enforce valid hsla values - refs #1954
handle duplicate hsl hue_to_rgb code
enhance scale-hsla validation - refs #1954
re-write scale-hsla filter to work in doubles, allowing proper clamping at the right time - refs #1954
+ restore family-name + style key
+ default to DejaVu Sans (ArialUnicodeMT is a monster when emitting PDFs)
viewer

* add export to cairo svg
* fix gpu/gl
Merge branch 'master' into skia-renderer
+ export as mapnik SVG