4.2.0 freeze in master

[Jonathan "Duke" Leto]

Howdy,

4.2.0 will be coming out on Tuesday-ish.

Please refrain from merging any big branches, but please feel free to
update the ChangeLog or do small doc fixes in master.

I will let everybody know when I am ready to cut a release tag.

Travis seems to say that master is broken on an optimized clang. Can
somebody throw some tuits at that?

Duke

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Jonathan "Duke" Leto <jonathan at leto.net>
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