Save depth-00 GO terms ordered using descendants cnt.

def _init_ns2nt(rcntobj):
        """Save depth-00 GO terms ordered using descendants cnt."""
        go2dcnt = rcntobj.go2dcnt
        ntobj = cx.namedtuple("NtD1", "D1 dcnt goobj")
        d0s = rcntobj.depth2goobjs[0]
        ns_nt = [(o.namespace, ntobj(D1="", dcnt=go2dcnt[o.id], goobj=o)) for o in d0s]
        return cx.OrderedDict(ns_nt)