Add a property 'fees' to the TransactionInfo class and use it.
This also changes the GUI behavior of the 'sent' field a little.
In the GUI we now show the amount actually meant to arrive on the other
address(es) instead of the amount our wallet became more empty.
This makes a lot of sense if you look at your transaction and compare to
an invoice, now the 'sent' field will match that invoice and it will
match what the receiver actually received.
tomFlowee