Release 0.18.0

[dnicolodi]

Is there anything else that we want to include in the 0.18.0 release?

Both #551 and #713 could be nice to have, but not a requisite for a release, IMO. #551 could be relatively easy to land. #713 requires more work.

[rgommers]

I'd be fine with either doing a release now, or getting one or both of those PRs in if there's energy to push on that. I'm pretty keen to see #551 merged, and I'd be happy to review - but I have 2 weeks of holiday planned for the second half of February, so realistically I probably won't be able to do much more than review/test.

[dnicolodi]

I'll try to get #551 ready for review in the next couple of days. It should be almost finished. The main thing left to do is probably adjusting the documentation.