__init__.py imports makes things confusing

Right now there's an __init__.py which imports five names from autoplot.autoplot, which makes it confusing because you can say both:

```python
from autoplot import javaaddpath  # and
from autoplot.autoplot import javaaddpath
```

I'm not sure what the motivation was*, but it seems misguided and confusing now.  * "Allow 'from autoplot import javaaddpath'" says the documentation.