WIP: A total rewrite#40

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joehuchette wants to merge 19 commits intomasterfrom

Commits on Mar 4, 2020

First pass at a new PWL API
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Commits on Mar 12, 2020

Working port of incremental and log 1D formulations
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Commits on Apr 11, 2020

Commits on May 18, 2020

More careful continuity checking
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