add chez to runtests#4

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jhidding wants to merge 4 commits intoijp:masterfrom

jhidding:master

Commits on Oct 27, 2016

add chez to runtests
jhidding
committed

Commits on Oct 30, 2016

accessor function for the minimum priority of a PSQ: `psq-min-priority`.
jhidding
committed

Commits on Dec 28, 2017