Pandas Pandas install includes hefty 29MB tests/ directory

This is particularly relevant to people trying to minimize virtualenvs for AWS Lambda, where a max file size is imposed.

pandas 0.22.0

Comment From: TomAugspurger

Dupe of https://github.com/pandas-dev/pandas/issues/19320

Hoping to fix this for 0.23. If you're interested you can take over my PR in https://github.com/pandas-dev/pandas/pull/19535

Comment From: TomAugspurger

Where also working on stripping unused symbols from the wheels, which should help even more: https://github.com/MacPython/pandas-wheels/pull/25