Update copyright script for 2003.

src/tools/copyright

-rgrepc -l 'Copyright.*Regents' | while read FILE
+rgrepc -l 'Copyright.*PostgreSQL Global Development Group' | while read FILE
 do
-	pipe sed 's/^\(.*\)\(Copyright.*Regents.*\)$/ * Portions Copyright (c) 1996-1999, PostgreSQL Global Development Group\
-\1Portions \2/g' $FILE
+	pipe sed 's/^\(.*Portions Copyright (c) 1996-\)[0-9]*\(, PostgreSQL Global Development Group/\12003\2/g' $FILE
 done