shithub: pprolog

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ref: 660d7d81eb1adcc2b108d0b150e3439972b1ec0a
parent: 95f874fe29b84394748d660a536a516277184288
author: Peter Mikkelsen <peter@pmikkelsen.com>
date: Wed Jul 7 11:01:04 EDT 2021

Add missing pre defined operators from iso prolog