DB stored incorrectly, when data includes iso_id's >=10

[okz]

The issue prevents loading DB's, even when they are downloaded with HAPI directly. e.g:

import hapi
import os

# start a fresh DB and download CO2=2, isotopologue=10
pathstr = './hapi/test'
hapi.db_begin(pathstr)
hapi.fetch('testme', 2, 10, 2250, 2251)
hapi.db_commit()

# open the DB path, loading the stored databases
hapi.db_begin(pathstr)    #  !this will cause an Exception

Viewing the data file, it seems HAPI saves the hitran file iso_id's in decimal, unlike the hitran web downloads:

#HAPI download
 210 2250.088119 1.280E-28 1.699E+02.06740.083 1682.20280.76-.002884       1 0 0 12       1 0 0 02                    R 36e     3777642231 5 4 5 7   150.0  146.0

#Hitran download
 20 2250.088119 1.280E-28 1.699e+02.06740.083 1682.20280.76-.002884       1 0 0 12       1 0 0 02                    R 36e     3777642231 5 4 5 7   150.0  146.0

During loads, HAPI expects the iso id's at a fixed location, and 1 digits. The Hitran Web downloads are loaded correctly, but files fetched with HAPI fail.