Add protection on upload if file already exists

htdocs/adherents/fiche.php

htdocs/admin/company.php

htdocs/admin/import/import.php

htdocs/comm/action/document.php

htdocs/comm/propal/document.php

htdocs/commande/document.php

htdocs/compta/facture/document.php

htdocs/compta/prelevement/fiche.php

htdocs/contrat/document.php

htdocs/ecm/docmine.php

htdocs/ecm/docother.php

htdocs/fourn/facture/document.php

htdocs/lib/functions.lib.php

htdocs/lib/ldap.class.php

htdocs/product.class.php

htdocs/product/document.php

htdocs/product/photos.php

htdocs/societe/docsoc.php

htdocs/telephonie/facturation/index.php

htdocs/telephonie/ligne/commande/retour/index.php