Merge branch 'develop' of https://github.com/Dolibarr/dolibarr.git into develop_bug2

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htdocs/contact/list.php

htdocs/core/actions_extrafields.inc.php

htdocs/core/class/extrafields.class.php

htdocs/core/lib/functions.lib.php

htdocs/core/tpl/admin_extrafields_add.tpl.php

htdocs/core/tpl/admin_extrafields_edit.tpl.php

htdocs/core/tpl/admin_extrafields_view.tpl.php

...estler/framework/Luracast/Restler/explorer/css/screen.css

...framework/Luracast/Restler/explorer/images/logo_small.png

...mework/Luracast/Restler/explorer/images/pet_store_api.png

...ramework/Luracast/Restler/explorer/images/wordnik_api.png

...es/restler/framework/Luracast/Restler/explorer/index.html

.../framework/Luracast/Restler/explorer/lib/swagger-oauth.js

...estler/framework/Luracast/Restler/explorer/lib/swagger.js

...restler/framework/Luracast/Restler/explorer/swagger-ui.js

...ler/framework/Luracast/Restler/explorer/swagger-ui.min.js

htdocs/install/mysql/migration/5.0.0-6.0.0.sql

htdocs/install/mysql/tables/llx_extrafields.sql

htdocs/langs/en_US/admin.lang