Fix: Removed a lot of warnings

htdocs/core/class/commonobject.class.php

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

htdocs/core/class/html.formsms.class.php

htdocs/lib/company.lib.php

htdocs/lib/functions.lib.php

htdocs/lib/functions2.lib.php

htdocs/main.inc.php