Merge pull request #1760 from FHenry/develop

ChangeLog

htdocs/compta/facture/class/facture.class.php

htdocs/contrat/class/contrat.class.php

htdocs/contrat/fiche.php

htdocs/contrat/liste.php

htdocs/core/modules/contract/mod_contract_magre.php

htdocs/core/modules/contract/mod_contract_olive.php

htdocs/core/modules/contract/mod_contract_serpis.php

htdocs/fourn/class/fournisseur.product.class.php

htdocs/install/mysql/migration/3.6.0-3.7.0.sql

htdocs/install/mysql/tables/llx_contrat.sql