'Add the new_members to this ConfigSection.
@param new_members  A dictionary of {key=Config(...), key2=Config(...)}.
@param overwrite  Whether to overwrite the current member on key conflict.'

def update_members(self, new_members, overwrite=True):

    for member in new_members.itervalues():
        assert (member.key is not _ANONYMOUS)
    if (not overwrite):
        new_members = new_members.copy()
        for k in self.members.iterkeys():
            if new_members.has_key(k):
                del new_members[k]
    self.members.update(new_members)
