Destination addresses support in outgoing payment transactions.

[lialsoftlab]

Without the support of the destination address array, it is not clear where the currency was transferred and in which transaction it was done.

[coveralls]

Pull Request Test Coverage Report for Build 127

• 8 of 8 (100.0%) changed or added relevant lines in 2 files are covered.
• 8 unchanged lines in 3 files lost coverage.
• Overall coverage increased (+0.9%) to 85.955%

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Files with Coverage Reduction	New Missed Lines	%
monero/transaction.py	1	95.41%
monero/numbers.py	2	97.62%
monero/ed25519.py	5	69.9%
<!--	Total:	8		-->

Totals
Change from base Build 116:	0.9%
Covered Lines:	869
Relevant Lines:	1011

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💛 - Coveralls

[emesik]

I changed the destionations list elements to tuples, to keep it simple and compatible with the format already used for transfer_multiple().

Thank you!

[lialsoftlab]

Ok. nice!