Commits on Jul 27, 2020

1. Add os.Rename wrapper for Plan 9 …

   os.Rename documentation says: "OS-specific restrictions may apply when
   oldpath and newpath are in different directories." On Unix, this means
   we can't rename across devices. On Plan 9 however, the functionality is
   even more limited: cross-directory renames are not allowed at all.
   
   Add a wrapper around os.Rename for Plan 9, which will copy the file if
   we're renaming across directory. All tests seems to pass.
   
   (Aside: I also had to write this wrapper to get go-git working on Plan 9:
   https://github.com/go-git/go-billy/blob/v5.0.0/osfs/os_plan9.go#L27
   but I notice few issues with that one.)
   
   Fixes ipfs#86

   

   fhs committed Jul 27, 2020
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