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As the next step in #3506, and following up from #3542 and #3558, upgrade Parity Ethereum (now OpenEthereum) from 2.6.8 (Dec 2019) to 2.7.2 (Feb 2020), the last release in the 2.x series.
This harmonizes our dependency graph with upstream, fixing numerous build errors from the upgrade and eliminating multiple versions of the same crates. This concerns the bn, ethabi, ethabi-contract, ethabi-derive, ethereum-types, keccak-hash, primitive-types, and uint crates as well as their transitive dependencies and their interdependencies.
The near/bn fork exists to upgrade bn's rand dependency. That's necessary because of a particularly complex dependency issue (rust-random/rand#645) in old versions of rand. We will eliminate the fork going forward once upstream upgrades their dependency (I will open a pull request for them).
The upstream changelog for 2.7.2 is at: https://github.com/openethereum/openethereum/blob/v2.7.2/CHANGELOG.md
The upstream diff from 2.6.8 to 2.7.2 is at: openethereum/openethereum@v2.6.8...v2.7.2