Add time estimation to processing display

[mattpass]

We can potentially show a relatively accurate number of mm:ss remaining if we work out when the last block occurred and how many confirmations are needed for this payment to be approved x 2.5 mins each.

ie, at point of putting in a transaction, I find the last block was 37 secs ago. If 6 confirms needed for this payment to be approved it's 150-37+((6-1)*150)

Could also add a merchant setting where they could determin if they want to show:

• est mm:ss remaining
• est mm remaining
• don't display est time remaining

[mattpass]

I think it doesn't look great afterall to indicate how long is remaining - proposing at the moment to ignore this request?

[mattpass]

I think this actually makes a point of one of the worst flaws of BTCP from a UX point of view, the fact that it will take many minutes to confirm a transaction of say 6 confirms. Not a good idea and so closing.