Common Lisp indentation improvements on defmethod and lambda-lists.

Common Lisp indentation improvements on defmethod and lambda-lists.
* cl-indent.el: Advertise the changes and remove obsolete TODO entries.
(lisp-lambda-list-keyword-parameter-indentation)
(lisp-lambda-list-keyword-parameter-alignment)
(lisp-lambda-list-keyword-alignment): New customizable user options.
(lisp-indent-defun-method): Improve docstring.
(extended-loop-p): Fix comment.
(lisp-indent-lambda-list-keywords-regexp): New variable.
(lisp-indent-lambda-list): New function.
(lisp-indent-259): Use it.
(lisp-indent-defmethod): Support for more than one
method qualifier and properly indent methods lambda-lists.
(defgeneric): Provide a missing common-lisp-indent-function property.