Fix the leaving of a temp file w/o partial-file saving.
Fixed bug 10350.
Undo the hard-link xattr optimization in 78286a03.

I'm backing out the xattr optimization that was put in to try
to make xattr data sending more optimal on hard-linked files.
The code was causing hard-to-reproduce bugs, and it's better to
get things done fully & correctly over fully optimally.
Mention the latest NEWS items.
Fix "unchanged" protocol designation.