Revert recent bookmark keybinding changes, thus returning to using

Revert recent bookmark keybinding changes, thus returning to using
three slots under C-x r.  See this message and its thread for details:
http://lists.gnu.org/archive/html/emacs-devel/2007-07/msg00705.html.

* lisp/bookmark.el: Revert revision 1.90 (commitid mWoPbju3pgNotDps).

* etc/NEWS: Revert revision 1.1509 (commitid xdXJjPiU1ZfI9Fps), which
  documented bookmark keybinding changes that were later reverted.

* man/ChangeLog: Remove ChangeLog entry for accidentally uncommitted
  changes to regs.texi that would have documented the keybinding
  change reverted above.