Add 'git svn help [cmd]' which works outside a repo.
Previously there was no explicit 'help' command, but 'git svn help' still printed the usage message (as an invalid command), provided you got past the initialization steps that required a valid repo. Signed-off-by: NBen Jackson <ben@ben.com> Acked-by: NEric Wong <normalperson@yhbt.net>
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