hgrecco / pint / 801

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Merge #637

637: Add Unit.from_ and Unit.m_from r=hgrecco a=virtuald

Converts from a number or quantity to the unit (or the magnitude). This is most useful for when you aren't sure if the input is a Quantity.

While you could technically use `ureg.check()` for this, it's syntactically cleaner (and I suspect more performant) to use this:

```
ureg.inch.from_(1*foot)
ureg.inch.from_(1, strict=False)
```

Added tests and docstrings. I'm not quite sure where in the docs this should go, but I'm willing to add a blurb in there if you'll point me to the right place.

Co-authored-by: Dustin Spicuzza <dustin@virtualroadside.com>

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