[FIX] make base_gs1_barcode installable. Relicence as AGPL-3. Match coding conventions more closely
[IMP] move the exception into the package's scope to make it easier to use from other modules. Now use "from base_gs1_barcode import InvalidGS1Barcode"
[MERGE] lp:~numerigraphe-team/stock-logistic-barcode/7.0-enable-gs1
[FIX]: missing import InvalidGS1Barcode on gs1_barcode.py
[FIX]: Bug when raise exception InvalidGS1Barcode