reference loop fix and tests, v2

[David Bremner]

David Bremner <david at tethera.net> writes:

> Here's a tidied version of the reference loop fix. There's actually
> only one non-comment line of code changed. As you can guess from the
> NEWS patch, I'm planning a point release to include this bugfix. I'd
> also like to include the mset fix [1], so it would be great if someone
> could test that.

Pushed this series, with the all import 's/!/! /' fix, and a reformatted
news entry, to release and master

d