Major mode for editing change logs; like Indented Text mode.
Prevents numeric backups and sets `left-margin' to 8 and `fill-column' to 74.
New log entries are usually made with M-x add-change-log-entry or C-x 4 a.
Each entry behaves as a paragraph, and the entries for one day as a page.
Uses keymap `change-log-mode-map', which is not currently defined. (fn)