fipy/meshes/uniformGrid3D.py: fix _cellToCellIDs and more concatenate() calls #478
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As far as I can tell, there were several codepaths in the UniformGrid3D class that seemed not to have been tested since they didn't work at all; in particular, the _cellToCellIDs map was broken. This commit fixes that (I hope) and a couple of more invalid
axis=n
keywords tonumerix.concatenate()
. Unfortunately I have not put together test cases for these problems, so I'm not completely sure that the "fixed" _cellToCellIDs is always correct.See issue #470, issue #475, and issue #477.