Idea: autocomplete for jc, jo, jco

Here's an idea for a new feature: autocomplete functions for `jc` `jo` and `jco`.
The one for `jo` should be the same already existing for `j`.
I can give it a go in my spare time if you want.
IMHO, from an usability point of view, I don't think I would even use autojump without an autocomplete function, so I think that an autocomplete for those 3 functions would be very very useful, even a "must have".