--backup leaves window where file doesn't exist.

[Dave Mielke]

When using --backup, the sequence (as monitored by strace) is:

   rename("/path/to/<file>", "<backup-dir>/<file><backup-suffix>")
   rename("/path/to/.<file>.xxxxxx", "/path/to/<file>")

This, of course, leaves a momentary window wherein <file> can't be found. Might 
it be possible to replace the first rename() with link() instead? This, of
course, could only be done when the backup directory is on the same volume.

-- 
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