Navigating autocompletion list

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This is a little tricky; I have always been able to do it by trial and error, but now I figured out the pattern.

Imagine this as not a list, but a table. Instead of

cyclic_permutations
cyclic_permutations_iterator
cyclotomic_cosets

cyclotomic_polynomial
cyclotomic_value

Think

cyclic_permutations                    cyclotomic_polynomial
cyclic_permutations_iterator           cyclotomic_value
cyclotomic_cosets

So the up/down arrows navigate only within their column, and the right/left arrows only function if you are in a row with more than one item. (Or maybe you can get from the end of one row to the end of the next, but anyway the left/right arrows are the ticket.)

This may be possible to make more obvious with some kind of reformatting. This is all handled in the function handle_introspection in sagenb/data/sage/js/notebook_lib.jsand I bet there is a way to make it better. I've made this https://github.com/sagemath/sagenb/is....