require-python syntax should provide for prefix lists (also, syntax is wrong)

[jjtolton]

Currently there is a mismatch between require-python syntax and require syntax.

(require '(a b c)) implies (require 'a.b 'a.c).

Currently, require-python syntax operates in the following manner:

(require-python '(a b c)) implies

(do 
  (require-python 'a)
  (require-python 'b)
  (require-python 'c))

This is incorrect.

(require-python '(a b c)) should also imply (require-python 'a.b 'a.c) (which also doesn't work), and (require-python 'a.b 'a.c) should imply

(do 
  (require-python 'a.b)
  (require-python 'a.c))

Special attention should also be paid to allow for (require-python '(a [b :as c :refer [blah]])) etc
which should imply (require-python '[a.b :as c :refer [blah]]).