[yt-svn] [yt_analysis/yt] Improve precision of constants (issue #479)

[Matthew Turk]

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New issue 479: Improve precision of constants
https://bitbucket.org/yt_analysis/yt/issue/479/improve-precision-of-constants

Matthew Turk:

The constants defined in `yt/utilities/physical_constants.py` are precise only to a few decimels.  We should use standardized IAU constants instead, to full precision available.

Responsible: MatthewTurk
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