Line number table (lnotab) not supported

[bjpop]

We do not currently generate the line number table (lnotab) for code objects.

[bjpop]

Support for lnotab is now available, although CPython seems to generate a table entry for every bytecode instruction, whereas we only generate an entry when the line number changes. Our approach produces shorter tables, but I'm not 100% sure if there aren't other reasons that CPython works the way it does.