Merge remote-tracking branch 'origin/3.7' into develop

htdocs/accountancy/class/bookkeeping.class.php

htdocs/accountancy/journal/purchasesjournal.php

htdocs/comm/propal.php

htdocs/core/class/commonobject.class.php

htdocs/core/lib/functions.lib.php

htdocs/core/tpl/objectline_create.tpl.php

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

htdocs/install/mysql/tables/llx_contrat.sql

htdocs/product/index.php

htdocs/societe/index.php

htdocs/user/card.php