CHG: Generalised AVar errors for compatibility with generalised Aff#18

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eric-corumdigital wants to merge 4 commits intopurescript-contrib:mainfrom

eric-corumdigital:general_errors

Commits on Aug 28, 2019

CHG: Generalised AVar errors for compatibility with generalised Aff
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Commits on Aug 29, 2019

CHG: Increased generality of new, empty, and status.
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CHG: Increased generality of tryTake, tryPut, tryRead, and kill.
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Commits on Sep 10, 2019

FIX: Map Either to AffResult
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