[FIX] fields: inherited fields should get 'string' from their parent field

Because some parameters of a field may be determined during its setup, we have
to update the corresponding column after the setup, and recompute _all_columns
to make it consistent.
[IMP] l10n_fr: remove dependency on l10n_fr_rib

The RIB (relevé d’identité bancaire) is no longer used in France since 1st of August 2014 (replaced by SEPA).