[hackers] add rotatestack()

From: <ssd_AT_mailless.org>
Date: Fri, 21 Oct 2016 09:49:07 +0200

the previous one wasn't tested properly, thus I'm resubmitting the
patch. this version fixes the behaviour in the presence of
floating/invisible clients.
Received on Fri Oct 21 2016 - 09:49:07 CEST

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