Fix 1462, 1468, 1480, 1483, 1490, 1497 $this instead of $object

Fix 1455 outstanding amount

ChangeLog

@@ -27,6 +27,8 @@ Fix: [ bug #1349 ] AJAX contact selector does not work fine in Project card
 Fix: [ bug #1452 ] variable used but not defined
 Fix: If multiprice level is used the VAT on addline is not correct
 Fix: [ bug #1254 ] Error when using "Enter" on qty input box of a product (on supplier order part)
+Fix: [ bug #1462, 1468, 1480, 1483, 1490, 1497] $this instead of $object
+Fix: [ bug #1455 ] outstanding amount
 
 ***** ChangeLog for 3.5.3 compared to 3.5.2 *****
 Fix: Error on field accountancy code for export profile of invoices.