hg64 multithreaded histograms

Since my blog post about hg64 histograms in July I have continued occasional hacking on the code, so it's time to post an update.

As before, my proof-of-concept histogram data structure hg64 is available from:

• https://dotat.at/cgi/git/hg64.git
• https://github.com/fanf2/hg64

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