User-defined SVG markers

[rschmehl]

Inkscape default markers are in
share/inkscape/markers/markers.svg

See "Custom Markers" in
http://tavmjong.free.fr/INKSCAPE/MANUAL/html/Customize-Files.html

[rschmehl]

Best option seems to be a configuration file (e.g. in the users dat_path) where the markers are linked and the arrow offsets stored.