Add module unique_supplier_invoice_number
unique_supplier_invoice_number: Fix missing import of account_invoice.
unique_supplier_invoice_number: fix duplicate -remove field supplier_invoice_number.
unique_supplier_invoice_number : update description + fix unicity per partner
account_invoice_unique_customer_ref : New module !
Fix after all the reviews :
• rename module unique_supplier_invoice_number to account_invoice_unique_supplier_invoice_number
• remove logos
• add .pot file to both modules  account_invoice_unique_supplier_invoice_number and account_invoice_unique_customer_ref
• add fr translation to both modules
• fix typo '# this function only works with one id' in both modules
• fix the missing spaces in the licence text for both modules
• fix the too long lines
All files Pep8 compliant
Rename module name to respect  XML-ID names restriction
Clean .pyc & .mo files
account_invoice_supplier_ref_unique : make constraint translation to work with different langage within same instance + add bwrsandman code suggestion
account_invoice_supplier_ref_unique : Fix msg typo
account_invoice_supplier_ref_unique : fix wrong field name to apply the constraint against + make the error message to be translatable
account_invoice_customer_ref_unique, account_invoice_customer_ref_unique: the contraint is now applied to all records modified; not only the first one.
Merge pull request #3 from savoirfairelinux/7.0_account_invoice_unique_customer_ref

7.0 account invoice unique customer ref