f3f4f0a4fb Multiple (batch) payment support in `direct_send()` (Kristaps Kaupe)
Pull request description:
Work towards #1012. Changes `direct_send()` to instead of single `amount` and `destination` to accept `dest_and_amounts` which is list of tuples of addresses and amounts instead. Haven't yet implemented and tested actual payments to multiple recipients, but tested that this doesn't break existing stuff.
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Tree-SHA512: 02195a28d071c9537cb5297e63854ad2571e0ae9b5e06b850d6173c47d53caae953e9d7671ff861a6584a104d7a59da2293781d4440f7db4814f9b2fc4116c46