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0051ba1596
A fairly complicated bit of modelling, mostly due to the quirks of how imports are handled in Python. A few notes: - The handling of `__all__` is not actually needed (and perhaps not desirable, as it only pertains to `import *`, though it does match the current behaviour), but it might become useful at a later date, so I left it in. - Ideally, we would represent `foo as bar` in an `import` as a `DefinitionNode` in the CFG. I opted _not_ to do this, as it would also affect points-to, and I did not want to deal with any fallout arising from that.