R4RS 6.8  (vector->list vector)  ==>  list
          (list->vector list)    ==>  vector

VECTOR->LIST returns a newly allocated list of the objects
contained in the elements of VECTOR. LIST->VECTOR returns a
newly created vector initialized to the elements of the list
LIST.

(vector->list '#(dah dah didah))  ==>  (dah dah didah)
(list->vector '(dididit dah))     ==>  #(dididit dah)
