[yt-dev] [yt_analysis/yt] Athena unitary units broken for domain_left_edge = 0.0 (issue #513)

[Sam Skillman]

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New issue 513: Athena unitary units broken for domain_left_edge = 0.0
https://bitbucket.org/yt_analysis/yt/issue/513/athena-unitary-units-broken-for

Sam Skillman:

Reported by Nick Moekel:

an example, with domain_left_edge = [0, 0, 0], and right_edge = [1, 1, 1]

```
#!python

In [18]: center=[0.5,0.5,0.5]
In [19]: lc = [0,0, 0.0, ,0.4]
In [20]: rc=[1.0,1.0,0.6]
In [21]: region = pf.h.region(center, lc, rc)
In [22]: region.volume()
Out[22]: -inf
```

This is caused by pf['unitary'] = -np.inf, because during the parsing of the parameter file, we guess that the domain_right_edge = - domain_left_edge.  This gets corrected during the hierarchy build, but the change doesn't propogate to fix pf['unitary'].  

Responsible: samskillman
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