Not working in "Elenor of Tsort"

[fabio-n]

After upgrade from Weatherwax to Release 2016-06-26a "Elenor of Tsort", this plugin stopped working.

Enabling debug in 'config' does dot give any clue.

[robbertmichel]

The released plugin worked fine for me on Elenor, it's also working for me in Release 2017-02-19b "Frusterick Manners".
I should note that I point to a plugable graphiz instance on a win10 machine.

[bug]

Probably a duplicate of #17