Overview of changes in gnome-calculator 3.18.3
* Fix: Chinese Yuan symbol, fixes #761075 (Alberto Ruiz)
* Fix: MathDisplay grabs focus after being shown, bug #748743 (Elita.A.A.Lobo)
* Fix: Missing mnemonic bond in Gross Profit Margin dialog (Martin Simon)
* Fix: Check if base exponent are complex for xpowy() method (Gerlof Fokkema)
* Fix: Prevent infinte loop on some operations with imaginary numbers, bug #757657 (Kyle Green)
* Fix: e^(-0.5) returned the wrong value, bug #756960 (Felix Pelletier)