display of the symbolic form of the OID. Remove code that used to do
that outside of "format_oid()".
Export "format_oid()" from "packet-snmp.c" and use it in
"packet-cops.c".
Remove support for CMU SNMP and older versions of UCD SNMP from
"packet-cops.c", as it has been removed from the rest of Ethereal.
svn path=/trunk/; revision=4924
Guy Harris