l10n_fr_oca duplicated tax groups

[sebastienbeau]

Reminder

• l10n_oca_fr does not depend on l10n_fr
• l10n_fr_ account_vat_return depends on l10n_fr and l10n_oca_fr

Account tax groups are provided by l10n_fr and l10n_oca_fr so we have duplicated tax groups.

Solution 1:

• l10n_oca_fr depend on l10n_fr and reuse the tax group of l10n_fr

Solution 2:

• remove the dependency of l10n_oca_fr in l10n_fr_account_vat_return and move the test of l10n_fr_account_vat_return into a dedicated test module and this module depend on l10n_oca_fr.

Solution 1 seem the only relevant solution, as most of the time both module are always installed

[alexis-via]

TODO : forward port to v16