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It took me a little while to figure out exactly what I wanted to do
here.
Initially, I was going to deprecate the standard gravity unit. Then I
realized we need it to define certain other units, such as the
correspondence between "pounds" as a force and a mass --- and I didn't
want to introduce a circular dependency between
:units
and:constants
.Then I was going to deprecate only the quantity maker,
standard_gravity
. But then I realized it would be weird to create asituation where certain units have quantity makers, and certain other
ones don't.
In the end, I think the right move is to just provide standard gravity
as a new constant. This is the preferred way to interact with it, but
the old ways will still be there for the foreseeable future.
Follow-on to #90.