Ver 1.6 2013-12-12 David Andersson
   Add keywords; Cleanup comments
Ver 1.5 2013-12-11 David Andersson
   Autoload and document `goto-last-change-reverse'
Ver 1.4 2008-09-20 David Andersson
   Improved property change description; Update comments.
Ver 1.3 2007-03-14 David Andersson
   Added `goto-last-change-reverse'
Ver 1.2 2003-04-06 David Andersson
   Don't let repeating error depthen glc-probe-depth.
Ver 1.1 2003-04-06 David Andersson
   Zero arg describe changes. Negative arg go back.
   Autoload. Remove message using nil in stead of an empty string.
Ver 1.0 2002-05-18 David Andersson
   Initial version
