Fix: Confusion between is_int and is_numeric.

htdocs/core/class/commonobject.class.php

htdocs/core/class/fileupload.class.php

htdocs/core/class/html.form.class.php

htdocs/master.inc.php

htdocs/public/members/new.php

htdocs/public/members/public_card.php

htdocs/public/members/public_list.php

htdocs/public/paybox/newpayment.php

htdocs/public/paybox/paymentko.php

htdocs/public/paybox/paymentok.php

htdocs/public/paypal/newpayment.php

htdocs/public/paypal/paymentko.php

htdocs/public/paypal/paymentok.php