git push origin developMerge branch 'atm-florian-dev_resource_extrafields' into develop

htdocs/admin/resource.php

htdocs/admin/resource_extrafields.php

htdocs/core/lib/resource.lib.php

htdocs/core/modules/modResource.class.php

htdocs/install/mysql/migration/4.0.0-5.0.0.sql

htdocs/install/mysql/tables/llx_resource_extrafields.key.sql

htdocs/install/mysql/tables/llx_resource_extrafields.sql

htdocs/langs/en_US/admin.lang

htdocs/resource/add.php

htdocs/resource/card.php

htdocs/resource/class/dolresource.class.php

htdocs/resource/list.php