inserttable() method allows to quickly
        insert large blocks of data in a table: it inserts the whole
        values list into the given table. The list is a list of
        tuples/lists that define the values for each inserted row. The
        rows values may contain string, integer, long or double (real)
        values.  Be very careful: this method
        does not type-check the fields according to the table
        definition; it just look whether or not it knows how to handle
        such types.