org-list: reorder file, rename functions, improve comments

* lisp/ob.el (org-babel-result-end): apply renaming.
* lisp/org-exp.el (org-export-mark-list-properties): apply renaming.
* lisp/org-list.el (org-list-prevs-alist): renamed from
  org-list-struct-prev-alist.
(org-list-parents-alist): renamed from org-list-struct-parent-alist.
(org-list-write-struct): renamed from org-list-struct-fix-struct.
(org-list-parse-list, org-sort-list, org-list-indent-item-generic,
org-toggle-checkbox, org-update-checkbox-count, org-cycle-list-bullet,
org-list-repair, org-insert-item, org-move-item-up, org-move-item-up,
org-move-item-down, org-next-item, org-previous-item,
org-end-of-item-list, org-beginning-of-item-list, org-apply-on-list):
apply renaming.
(org-get-bullet): removed function, as it is not needed anymore.

lisp/ob.el

@@ -77,7 +77,7 @@
 (declare-function org-list-parse-list "org-list" (&optional delete))
 (declare-function org-list-to-generic "org-list" (LIST PARAMS))
 (declare-function org-list-struct "org-list" ())
-(declare-function org-list-struct-prev-alist "org-list" (struct))
+(declare-function org-list-prevs-alist "org-list" (struct))
 (declare-function org-list-get-list-end "org-list" (item struct prevs))
 
 (defgroup org-babel nil
@@ -1585,7 +1585,7 @@ code ---- the results are extracted in the syntax of the source
     (cond
      ((org-at-table-p) (progn (goto-char (org-table-end)) (point)))
      ((org-at-item-p) (let* ((struct (org-list-struct))
-			     (prevs (org-list-struct-prev-alist struct)))
+			     (prevs (org-list-prevs-alist struct)))
 			(org-list-get-list-end (point-at-bol) struct prevs)))
      (t
       (let ((case-fold-search t)

lisp/org-exp.el

@@ -1718,7 +1718,7 @@ These special properties will later be interpreted by the backend."
 	    (let* ((struct (org-list-struct))
 		   (top (org-list-get-top-point struct))
 		   (bottom (org-list-get-bottom-point struct))
-		   (prevs (org-list-struct-prev-alist struct))
+		   (prevs (org-list-prevs-alist struct))
 		   poi)
 	      ;; Get every item and ending position, without dups and
 	      ;; without bottom point of list.

lisp/org-timer.el

@@ -209,15 +209,15 @@ it in the buffer."
   (interactive "P")
   (let ((itemp (org-in-item-p)))
     (cond
-     ;; In a timer list, insert with `org-list-insert-item-generic',
+     ;; In a timer list, insert with `org-list-insert-item',
      ;; then fix the list.
      ((and itemp
 	   (save-excursion (goto-char itemp) (org-at-item-timer-p)))
       (let* ((struct (org-list-struct))
-	     (prevs (org-list-struct-prev-alist struct))
+	     (prevs (org-list-prevs-alist struct))
 	     (s (concat (org-timer (when arg '(4)) t) ":: ")))
-	(setq struct (org-list-insert-item-generic (point) struct prevs nil s))
-	(org-list-struct-fix-struct struct (org-list-struct-parent-alist struct))
+	(setq struct (org-list-insert-item (point) struct prevs nil s))
+	(org-list-write-struct struct (org-list-parents-alist struct))
 	(looking-at org-list-full-item-re)
 	(goto-char (match-end 0))))
      ;; In a list of another type, don't break anything: throw an error.

lisp/org.el

@@ -11821,7 +11821,7 @@ EXTRA is additional text that will be inserted into the notes buffer."
   (if (looking-at "\n[ \t]*- State") (forward-char 1))
   (when (ignore-errors (goto-char (org-in-item-p)))
     (let* ((struct (org-list-struct))
-	   (prevs (org-list-struct-prev-alist struct)))
+	   (prevs (org-list-prevs-alist struct)))
       (while (looking-at "[ \t]*- State")
 	(goto-char (or (org-list-get-next-item (point) struct prevs)
 		       (org-list-get-item-end (point) struct)))))))
@@ -17404,8 +17404,8 @@ This command does many different things, depending on context:
       (let* ((cbox (match-string 1))
 	     (struct (org-list-struct))
 	     (old-struct (mapcar (lambda (e) (copy-alist e)) struct))
-	     (parents (org-list-struct-parent-alist struct))
-	     (prevs (org-list-struct-prev-alist struct))
+	     (parents (org-list-parents-alist struct))
+	     (prevs (org-list-prevs-alist struct))
 	     (orderedp (ignore-errors (org-entry-get nil "ORDERED")))
 	     block-item)
 	(org-list-set-checkbox (point-at-bol) struct
@@ -17430,8 +17430,8 @@ This command does many different things, depending on context:
       ;; an argument
       (let* ((struct (org-list-struct))
 	     (old-struct (mapcar (lambda (e) (copy-alist e)) struct))
-	     (parents (org-list-struct-parent-alist struct))
-	     (prevs (org-list-struct-prev-alist struct)))
+	     (parents (org-list-parents-alist struct))
+	     (prevs (org-list-prevs-alist struct)))
 	(org-list-struct-fix-ind struct parents)
 	(org-list-struct-fix-bul struct prevs)
 	(when arg