Feature request: use rsvg-convert

Feature request: use rsvg-convert

[Thangalin]

Hi,

Re: http://wiki.contextgarden.net/Using_Graphics#Image_Conversion

I recommend using rsvg-convert instead of inkscape. For example:

wget http://en.wikipedia.org/wiki/File:Inkscape_0.48.2_with_Red_Gallardo.svg
-O car.svg
time rsvg-convert --format pdf car.svg --output car-rsvg.pdf
time inkscape --file=car.svg --export-pdf=car-inkscape.pdf --without-gui

wget http://openclipart.org/download/people/TheStructorr/TheStructorr_Lamborghini_Gallardo.svg
-O car2.svg
time rsvg-convert --format pdf car2.svg --output car2-rsvg.pdf
time inkscape --file=car2.svg --export-pdf=car2-inkscape.pdf --without-gui

Here, inkscape is slightly faster yet produces slightly larger files.

inkscape 0.48.4 r9939 (Jan 22 2014)
rsvg-convert version 2.40.2

More importantly, inkscape renders incorrectly. The horizontal and
vertical rule marks are missing in the first image. The gradient
shadows are missing in the second image, and the grill is incorrect
(looks like a layer order issue).
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