Added HasCallStack to partial functions#493

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dwincort wants to merge 5 commits intohaskell:masterfrom

dwincort:master

Commits on Jan 13, 2018

Added HasCallStack to partial functions
Daniel.Winograd-Cort
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Added CPP to restrict to GHC>800
Daniel.Winograd-Cort
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Commits on Jan 15, 2018

Remove HasCallStack where undesired
Daniel.Winograd-Cort
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Fixes
Daniel.Winograd-Cort
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Commits on Feb 6, 2018

Reverting behavior of (!) to not allocate Just
Daniel.Winograd-Cort
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