Bug#1103140: python-momepy test failures

[Rebecca N. Palmer]

Those all look like rounding errors (probably due to x87 excess 
precision, since they only happen on i386).  This suggests that the 
appropriate response is either to ignore these tests on i386, or 
possibly (the graph object output by gdf_to_nx has (x: float, y: float) 
node keys, so rounding issues can potentially break retrieving 
individual nodes/edges) to remove this package on i386.