Autocompletion support for Notebook

[noklam]

Supportcatalog.load(" (Hit Tab)-> catalog.load("shuttle"). catalog.datasets was introduced to support autocompletion but it suffers from the . attribute of python. As a result there is a workaround to transform it to __, but it makes thing inconsistent.

There is an opportunity to enable autocompletion support on notebook.

Challenge:

• The main challenge is how to make autocomplete triggers at the right time. i.e. I don't want the catalog entry when I am just typing some random strings or docstring.