Add defaults during concat 508#3545

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scottcha wants to merge 14 commits intopydata:mainfrom

scottcha:add-defaults-during-concat-508

Commits on Nov 17, 2019

Commits on Nov 20, 2019

Commits on Dec 30, 2019

Improved implementation of concat which respects type promotion, ordering and variable types when variables are missing
scottcha
committed

Commits on Dec 31, 2019

refactor variable promotion logic to dtypes.py
scottcha
committed

Commits on Jan 24, 2020

Commits on Feb 15, 2020