Picture resolutions: try to generate .svg graphics where possible to avoid losses during scaling

[xdbr]

Note: Try to produce svg with all renderers and as a default if that is possible.

For now, a first quick round of investigation yields:

• ditaa: N/A ?
• dot: use -Tsvg on dot command
• rdfdot: use file extension .svg on output file of renderer-command
• yuml.me: use file extension .svg on output file of renderer-command (caution: this has to go through another python module, maybe do a curl oneself instead?)
• plantuml: use -tsvg on renderer command

[nichtich]

For PDF one cannot simply use SVG and support of SVG for PDF in pandoc will not be implemented (jgm/pandoc#265), so SVG as default is problematic. A possible workardound is to use inkscape with ConTeXt or svg-inkscape with a wrapper. If ppp can be this wrapper, use of SVG in Pandoc Markdown would be possible. Inkscape can also convert SVG to PNG with a given size in pixel:

inkscape -z -e image.png -w 800 -h 600 image.svg

[xdbr]

Closing as fixed in v0.9.0