Hi,
Has anyone figured out a nicer way to "inherit" from the provided prtractor.TractorScheduler.

I'm attempting to add some basic extra functionality but it seems the only way to do this is to 'hack' the python path.
```
sys.path.append(os.path.expandvars("$HFS/houdini/pdg/types/schedulers"))
from prtractor import TractorScheduler
sys.path.pop()
```

This is because the tractor scheduler isn't on the python path at the point of my custom tractor scheduler being registered.
So without the hack you get import errors etc.

Is there a nicer way to do this?
Maybe I just need to put in a feature request to have the sidefx pdg/types/schedulers earlier in the python path so they can be imported by my custom scheduler?

Cheers!