babel: flip default values of :hlines header arg

contrib/babel/lisp/langs/org-babel-emacs-lisp.el

@@ -36,7 +36,7 @@
 (add-to-list 'org-babel-tangle-langs '("emacs-lisp" "el"))
 
 (defvar org-babel-default-header-args:emacs-lisp
-  '((:hlines . "no") (:colnames . "no"))
+  '((:hlines . "yes") (:colnames . "no"))
   "Default arguments to use when evaluating an emacs-lisp source block.")
 
 (defun org-babel-expand-body:emacs-lisp (body params &optional processed-params)

contrib/babel/lisp/org-babel.el

@@ -96,7 +96,7 @@ header arguments as well.")
 
 (defvar org-babel-default-header-args
   '((:session . "none") (:results . "replace") (:exports . "code")
-    (:cache . "no") (:noweb . "no") (:hlines . "yes"))
+    (:cache . "no") (:noweb . "no") (:hlines . "no"))
   "Default arguments to use when evaluating a source block.")
 
 (defvar org-babel-default-inline-header-args