[COMMIT] Import Edward O'Connor's json.el

[Stephen J. Turnbull]

VETO
 
Get this OUT of net-utils!

Aidan Kehoe writes:
 > 
 > Ted, this makes your json.el more easily available to XEmacs users. Included
 > is a tweak to have it better work on non-Mule XEmacs invocations. 
 > 
 > APPROVE COMMIT
 > 
 > NOTE: This patch has been committed.
 > 
 > SUPERSEDES 17793.19077.50295.840813 at parhasard.net
 > 
 > xemacs-packages/net-utils/ChangeLog addition:
 >