Calculate what extensions could apply with an extension tree#2061

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jcollins-g wants to merge 5 commits intomasterfrom

Commits on Nov 4, 2019

intermediate -- tests pass
jcollins-g
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Commits on Nov 5, 2019

First version of extension tree complete
jcollins-g
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Commits on Nov 6, 2019

it works
jcollins-g
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Commits on Nov 7, 2019