weights.plot does not handle named observations

[ljwolf]

right now, if you have weights constructed using an idVariable or ids list, the plot method fails.

This is because it is using the iloc method to do lookups based on iteration indices.

It should be possible to rework this to use names and only names.

[ljwolf]

This is not fixed by #231 (moving to splot weights) which means that the fix must be implemented in splot.plot_spatial_weights.

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