Minor changes related to commit 8ac33e9

* Updated changelog
* Function `getTotalDiscount` from commonobject.class.php should always return a float. Also removed comment that if there is no discount, 0.00 is returned as it is the expected result...

As usual, many changes are shown because of incorrect line endings.

Link to commit: 8ac33e98e7da9be90f08719e404c78b1dd16d50a