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fix: handle negative line number deltas #73
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In Python 3.6-3.9, unlike in Python 2, co_lnotab's line number offsets can be negative and are represented by a signed integer. The Debugger agent had been using an unsigned integer which prevented it from being able to set breakpoints on lines of code in a code object after the line table had a negative offset.
This PR also enables most of the previously disabled tests now that they work on all supported versions of Python. A couple still remain disabled and will be fixed later on.