Create/open local SQLite database

def _dbsetup(self):
        """ Create/open local SQLite database
        """
        self._dbconn = sqlite3.connect(self._db_file)
        # Create table for multiplicons
        sql = '''CREATE TABLE multiplicons
                 (id, genome_x, list_x, parent, genome_y, list_y, level,
                  number_of_anchorpoints, profile_length, begin_x, end_x,
                  begin_y, end_y, is_redundant)'''
        self._dbconn.execute(sql)
        # Create table for multiplicons ('order' appears to be reserved)
        sql = '''CREATE TABLE segments
                 (id, multiplicon, genome, list, first, last, ord)'''
        self._dbconn.execute(sql)
        self._dbconn.commit()