code: public static void renew(GramJob job, GSSCredential newCred)
          throws GramException, GSSException {
          renew(job, newCred, true);
      }
docs: Requests that a globus job manager accept newly delegated credentials.
  Uses limited delegation.
  
  @param job The job whose credentials are to be renewed/refreshed
  @param newCred The credentials to use in the delegation process
  @throws GSSException if a GSSAPI error occurs
  @throws GramException if a connection/communication error occurs or if
  delegation failed