Python 3 problem with division
Thanks, good catch.

All the other mathematical operators work fine in queries, but division doesn't.  This is most likely because Python3 killed `__div__` in favor of `__truediv__` and `__floordiv__`.

After the line that reads::

```
__div__ = _e(OP_DIV)
```

I put::

```
__truediv__ = _e(OP_DIV)
```

And that seemed to fix it, but I'm not set up to run full regression tests on things.
