Fix: Removed warnings

htdocs/admin/dict.php

htdocs/comm/action/class/actioncomm.class.php

htdocs/comm/propal/class/propal.class.php

htdocs/comm/propal/stats/index.php

htdocs/commande/stats/index.php

htdocs/compta/paiement/cheque/class/remisecheque.class.php

htdocs/core/class/conf.class.php

htdocs/core/lib/agenda.lib.php

htdocs/fourn/class/fournisseur.facture.class.php

htdocs/index.php

htdocs/install/inc.php

htdocs/paypal/lib/paypal.lib.php

htdocs/product/class/product.class.php

htdocs/projet/class/task.class.php

htdocs/public/demo/index.php

htdocs/public/paypal/paymentok.php

htdocs/support/inc.php

htdocs/user/class/user.class.php

htdocs/user/class/usergroup.class.php