Add alias 'gaussian' to point towards 'gaussian_filter' in ndfilters

I’d like an alias added so that gaussian also points to gaussian_filter in the ndfilters subpackage.

[K-Monty]

I have just tried it @GenevieveBuckley ! 😃 But not sure if this is what’s requested: https://github.com/dask/dask-image/pull/193

[GenevieveBuckley]

Thoughts:

1. Add aliases to existing modules (like what is currently proposed)

I’m happy to do this in cases where it’s likely to be a common irritation.

Looking at this another way: there is already one way to call a gaussian filter in scikit-image, and another way to do it in scipy.ndimage/dask-image. The current situation is not exactly “there is one obvious way to do it” anyway.

2. Provide interfaces that match common naming schemes (`dask_image.scipy`, `dask_image.skimage`, etc.)

I do not think we can commit to this, it seems unfeasible to me.

3. Enable some kind of dispatching inside scikit-image to call the appropriate dask-image function

This is a much better idea than 2. You could have 1 and 3 together if you wanted, or separately. I think our recent conversation with Juan & Greg was promising.