More list ops

[kboga]

fix: plan
refactor: making code for list generation
add: list_(n,s) ops

just an experiment :)

[kboga]

It should be trivial to add the Fixed(PMC|Integer|Float|String)Array forms as well.
Not sure how their ops should be named though.

[kboga]

You are absolutely right of course :)
Seeing the list & list_i I thought there was some code duplication.
So refactored that and then I got too excited and added them all.
Anyways was just experimenting here.

Feel free to close instead of merging