[MERGE] Update NEWS with missing items ready for 0.18rc1

[Ian Clatworthy]

As part of the release process, I cross check the NEWS entries against
the output of 'bzr log --short' and BundleBuggy. Here are the updates
I'm proposing to make just before I cut 0.18 RC1 tomorrow. If anyone has
any feedback on the wording I've added, please reply and let me know.

This is up to date as of rev 2595, Andrew's changes for -Dhpss. If
anyone merges low risk changes to PQM in the next 12 hours, please
remember to update NEWS.

Thanks,
Ian C.
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