[yt-dev] Issue #1123: Positions of opaque sources should be specifiable with units (yt_analysis/yt)

[Nathan Goldbaum]

New issue 1123: Positions of opaque sources should be specifiable with units
https://bitbucket.org/yt_analysis/yt/issues/1123/positions-of-opaque-sources-should-be

Nathan Goldbaum:

Right now, `LineSource`, `PointSource`, etc positions must be specified as ndarray isntances and are assumed to be in code units. We should be able to specify these in an arbitrary unit system and then convert the positions to code units when needed.