* Add support for zstd and split compression
Add support for using zstd as an alternative to native, lz4.
Upgrade lz4 to v1.9.4 (with ARM enhancements).
Allow for split compression algorithms - i.e. use native on journal, but lz4 on ledger.
* Switch to AdRoll zstd
Development appears to be active and ongoing. No issues running on different linux flavours.
* Use realistic bucket name
* Update README.md
* Switch branch
* Add comment following review
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