Round out data/list

[Shamrock-Frost]

The git history should be a lot nicer now.

[lexi-lambda]

This looks great. Two questions:

1. Is there any reason to call /= not=? I think /= is an alright name, though I’m open to arguments against it.

2. Can you add documentation for the functions added in the last of these three commits?

Thanks.

[Shamrock-Frost]

For 1, I was copying what clojure called it (same with nth). I'll change it to /= to keep with haskell. I'll add documentation tonight, sorry for the delay.

[lexi-lambda]

Oh, gotcha, I didn’t realize Clojure had a function named not=. It probably doesn’t matter too much, but I think it makes sense to stick with Haskell here.

And no worries—I’d just like to make it a policy to avoid adding functions to the standard library without also adding documentation, but there’s no rush.

[Shamrock-Frost]

The documentation has been added.