Merge pull request #1892 from GPCsolutions/php56

dev/skeletons/skeleton_webservice_server.php

htdocs/webservices/server_actioncomm.php

htdocs/webservices/server_category.php

htdocs/webservices/server_contact.php

htdocs/webservices/server_invoice.php

htdocs/webservices/server_order.php

htdocs/webservices/server_other.php

htdocs/webservices/server_productorservice.php

htdocs/webservices/server_supplier_invoice.php

htdocs/webservices/server_thirdparty.php

htdocs/webservices/server_user.php