Message 301374 - Python tracker

Steve's also requested the ability to *turn off* line debugging, and I'm thinking it may make sense to allow all four configurations:

* both line and opcode events disabled
* only getting one or the other
* getting both kinds of event

Opcode events would definitely be off by default, and if you do turn them on, then you'd be in a situation similar to importing ctypes: the interpreter is no longer guaranteed to work correctly. (Although unlike ctypes, you shouldn't get segfaults because of it)