Fixes `niminst zip` not creating output dir & cleans related code.
Fixes `niminst zip` not creating output dir & cleans related code.

singularperturbation/Nim,singularperturbation/Nim,tulayang/Nim,singularperturbation/Nim,jfhg/Nim,russpowers/Nim,dom96/Nim,jfhg/Nim,tulayang/Nim,dom96/Nim,dom96/Nim,russpowers/Nim,jfhg/Nim,dom96/Nim,russpowers/Nim,singularperturbation/Nim,dom96/Nim,russpowers/Nim,jfhg/Nim,singularperturbation/Nim,jfhg/Nim,russpowers/Nim,dom96/Nim,tulayang/Nim,jfhg/Nim,russpowers/Nim,tulayang/Nim,singularperturbation/Nim,tulayang/Nim,dom96/Nim,russpowers/Nim,jfhg/Nim,singularperturbation/Nim,tulayang/Nim