conf_file a file opened for reading.

        Update the packs channel names and the conditions, accordingly.

def eat_config(self, conf_file):
        """conf_file a file opened for reading.

        Update the packs channel names and the conditions, accordingly.

        """

        # Read the file:
        cfg = ConfigParser.RawConfigParser()
        cfg.readfp(conf_file)

        # Update channel names:
        sec = 'channels'
        mess = 'missmatch of channel keys'
        assert(set(self.pack.D.keys()) == set([int(i) for i in cfg.options(sec)])), mess  # NOQA
        if not self.pack.chnames:
            self.pack.chnames = dict(self.pack.chnames_0)
        for i in cfg.options(sec):  # i is a string.
            self.pack.chnames[self.pack._key(int(i))] = cfg.get(sec, i)

        # Update conditions:
        sec = 'conditions'

        # conkeys = set(self.conditions.keys())
        # conops = set(cfg.options(sec))

        # This check should be superfluous:
        # --------------------------------------------------
        # for conkey in conkeys:
        #     if not any([conkey.startswith(c) for c in _COND_PREFIXES]):
        #         raise KeyError(conkey)
        # --------------------------------------------------

        # for con in conkeys - conops: # Removed conditions.
        # self.set_condition(con, None)
        conops = cfg.options(sec)
        self.reset()            # Scary
        for con in conops:
            self.set_condition(con, cfg.get(sec, con))