revlog-compression: update the config to be a list
format.revlog-compression is now a list of engine, the first supported one is to be used. Doing this have several benefits: 1) this is fully backward compatible, config using a single entry will be read as a single item list, not changing any behavior. 2) This open the way to use zstd by default without impacting platform were it is not available. This will be done in a later changesets. Using zstd provide a significant performance boost explained in : bb271ec2fbfb. However zstd is not available in some cases, A notable example is the `--pure` version of Mercurial which doesn't come with zstd support. Differential Revision: https://phab.mercurial-scm.org/D8148
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- mercurial/configitems.py 1 addition, 1 deletionmercurial/configitems.py
- mercurial/helptext/config.txt 2 additions, 1 deletionmercurial/helptext/config.txt
- mercurial/localrepo.py 8 additions, 5 deletionsmercurial/localrepo.py
- mercurial/upgrade.py 8 additions, 1 deletionmercurial/upgrade.py
- tests/test-repo-compengines.t 6 additions, 1 deletiontests/test-repo-compengines.t
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