Logging info doesn't use correct units

[biboyd]

This looks like a small bug from the addition of velocities. In the logging info it tries to compare thermal_width (which is in angstroms) to self.bin_width (which can be in km/s). YT then complains and the program crashes. This only occurs of course if you set the resolution relatively high.

Changing to my_width (like in the if statement above) fixes things nicely so that the units always match.

I tried to search through and didn't find any other case where thermal_width was still being used incorrectly.

[brittonsmith]

@boydbre1, good catch! Thanks for fixing this.

[coveralls]

Pull Request Test Coverage Report for Build 991

• 0 of 0 changed or added relevant lines in 0 files are covered.
• 24 unchanged lines in 1 file lost coverage.
• Overall coverage decreased (-0.06%) to 74.723%

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Files with Coverage Reduction	New Missed Lines	%
/home/travis/build/trident-project/trident/trident/ion_balance.py	24	84.06%

Totals
Change from base Build 988:	-0.06%
Covered Lines:	1756
Relevant Lines:	2350

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💛 - Coveralls