Merge ~dhuggins/ubuntu/+source/graphviz:dhd/fix_2015017_2015023 into ubuntu/+source/graphviz:ubuntu/devel

As mentioned in LP: #2015023 I think the python2 changes aren't valid (python2 was removed in lunar and the present graphviz version has been building happily in lunar and mantic), but the LP: #2015017 bug looks valid. If the python compatibility changes could be removed, I could see about getting this sponsored for mantic?

(as an aside: I had a quick check upstream and the latest version in Debian is 2.42.2-7 as well so we can't sync the fixes from there yet)

You can just remove the python stuff.... I really just care about the SVG problem, which makes it super annoying to use graphviz in Jupyter, among other things.

But again ... and it's not your fault ... why in the world has it been four years since Debian/Ubuntu updated the version?

Graphviz introduced this bug in 2.42.0, there was a 2.42.4 patch release that fixes it

But this release can no longer be found on their download page because it's so ancient!!!

Deleted some overly incendiary comments.

I've updated this to fix only the one problem which has been causing me immense frustration for over a year now.

If you could *please* take a look at this soon that would be really great.

Sorry I let my frustration with the general level of brokenness I encounter in Ubuntu packages get the best of me, nothing personal. In the meantime I'll be updating documentation to say "don't install graphviz from Debian/Ubuntu, it is ancient and has annoying bugs".