docs: def _create_table(self, packet_defn):
          ''' Creates a database table for the given PacketDefinition
  
          Arguments
              packet_defn
                  The :class:`ait.core.tlm.PacketDefinition` instance for which a table entry
                  should be made.
          '''
          cols = ('%s %s' % (defn.name, self._getTypename(defn)) for defn in packet_defn.fields)
          sql  = 'CREATE TABLE IF NOT EXISTS %s (%s)' % (packet_defn.name, ', '.join(cols))
  
          self._conn.execute(sql)
          self._conn.commit()