(lisp-loop-keyword-indentation)

(lisp-loop-keyword-indentation)
(lisp-loop-forms-indentation, lisp-simple-loop-indentation): New
user options.
(extended-loop-p, common-lisp-loop-part-indentation): New
functions.
(common-lisp-indent-function-1): Renamed from
common-lisp-indent-function.
(common-lisp-indent-function): Handle loop forms specially.
(lisp-indent-defmethod): Use car/cdr instead of first/rest.