xed THANKS file

xed (perl implementation) has originally been written by Cliff Miller.
Many people have further contributed to xed by reporting problems, 
suggesting various improvements, or submitting actual code.  Here is
a list of these people.  Help me keep it complete and exempt of errors.

John Linderman (ksh implementation original author)
Bob Flandrena
Christophe Kalt
Mark Plotnick
Tom Reingold
Rajeev Agrawala
Paul Glick
Tom Limoncelli
