Message 237670 - Python tracker

The column offset has always been the offset of the start of the expression. Therefore the expression `x.y` should have the same offset as the sub-expresssion `x`.
Likewise for calls, `f(args)` should have the same offset as the `f` sub expression.

Our static analysis tool is a real-world use case:
http://semmle.com/2014/06/semmle-analysis-now-includes-python/

Presumably the submitter of this issue also had a real would use case.