Eliminated the Map from MerkleMap#47

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balena wants to merge 6 commits intoderekkraan:masterfrom

Commits on May 13, 2020

Eliminated the redundant Map, using only a MerkleMap now to reduce memory usage.
balena
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Commits on May 14, 2020

Just replaced by the new merkle_map version 0.2.1
balena
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Commits on May 25, 2020

Using best effort send with option [:nosuspend] to avoid stucking the Crdt process when Erlang's cluster connection isn't steady.
balena
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Handling the case where the diff couldn't be sent back to requester, and added a limited number of retries.
balena
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Retrying also the :get_diff message.
balena
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Commits on May 26, 2020

Now outstanding_syncs can have stale entries (whose value = 0), so it must be considered during :set_neighbours message.
balena
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