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Merge branch 'master' into temp-ghash-setops

Merge branch 'master' into temp-ghash-setops

Merge branch 'master' into temp-ghash-setops

Get rid of varargs in union & co functions (using variadic macros instead).

Some improvements/tweaks from review.

Merge branch 'master' into temp-ghash-setops

Remove gtests.

Squashed commit of temp-ghash-experiments, minus the 'hash storage' part.

Remove public GHash API for union/inter/diff/symmdiff.

This is dead easy to add back when we want (or use other naming if we really
like them better), core code remains exactly the same anyway.

Note we keep checks (isdisjoint, isequal, etc.) for ghashes though, those are
pure-keys non-modifying operations anyway, so here set ops for ghash are
definitively valid (equivalent of set ops on dict.keys() views in py).

Fix for updates in master...

Revert "Remove gtests."

This reverts commit 2b8fac2a153e135d0f6cc7621a3755901477fd3d.