WIP: An attempt at allowing the 'TCB' units in PINT#465

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mattpitkin wants to merge 4 commits intonanograv:masterfrom mattpitkin:tcb

+730-53

Commits on Feb 6, 2019

An attempt at allowing the 'TCB' units in PINT:
mattpitkin
committed

Commits on Feb 19, 2019

Commits on Mar 6, 2019

Some attempts at making topocentric corrections work
mattpitkin
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