Renamed 'install_path' to 'extra_path'. Fix 'Command.set_undefined_option()' to call 'ensure_ready()' rather   than 'finalize_options()' (which is only supposed to be called once,   which is the whole point of 'ensure_ready()'). Added comment to 'set_peer_option()' to remind myself that this method   cannot work and is fundamentally wrong-headed.
Renamed 'install_path' to 'extra_path'.
Fix 'Command.set_undefined_option()' to call 'ensure_ready()' rather
  than 'finalize_options()' (which is only supposed to be called once,
  which is the whole point of 'ensure_ready()').
Added comment to 'set_peer_option()' to remind myself that this method
  cannot work and is fundamentally wrong-headed.

pypa/setuptools,pypa/setuptools,pypa/setuptools