Gui labels

[edouardparis]

This PR use the lianad update_labels and get_labels commands.
It also introduce new concepts from talks with Kevin and Antoine:

• User spending is creating a payment, when he does not add multiple recipients anymore, he is doing multiple payment in one bitcoin transaction.
• a transaction that have multiple outgoing outputs (multiple payment) is tagged as a 'Batch'.

[pythcoiner]

I've built + run, it seems that adding a label on outgoing tx not confirmed will not save the label.
edit: only from the transaction menu

[pythcoiner]

I've built + run, it seems that adding a label on outgoing tx not confirmed will not save the label. edit: only from the transaction menu

I dig more into that:

• the label is well saved but the displayed label in transaction menu is not updated, i need to go to another menu and then come back to transaction menu to update the label.
• I wonder why we got a payment label and a transaction label? can a payment contain several tx? it's not really clear to me...

[edouardparis]

Self-ACK 757b53e

[edouardparis]

Thanks for finding the pending txs bug @pythcoiner
I updated the PR description about the change of payments/batch transactions.
We want to gather more feedback from this state with other features, so I choose to merge it and cut in multiple issues the returned feedback from the team.