[gl2ps] SVG image scaling

[Pantxo Diribarne]

Hi,

In Octave we found out that, in the SVG output of gl2ps, images were not 
scaled properly (see [1]). I attached a patch that makes things works as 
in postscript. I used the "transform" attribute of image elements to 
setup a transformation matrix.

Thanks,

Pantxo

[1] https://savannah.gnu.org/bugs/?func=detailitem&item_id=37753
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