Show transaction fees

[raedah]

Transaction view should show Fee and Fee/size
Lets try and fit this on the transaction rows partial as well (and stake tx since they also have fees.)

For blocks, calculate mining fees collected in block (spent - sent).

[raedah]

Transaction fee is showing N/A on unconfirmed transactions, but we already know the fee before it gets confirmed so we should show it.

Vote txs are not showing fee but should show just like a regular transaction.

[chappjc]

The unconfirmed issue goes back to this: #142

Regarding votes and fees, I'm pretty sure votes don't pay fees.

[chappjc]

closed by #202