[MERGE] Support FTP servers with non-atomic rename (bug #89436)

[Aaron Bentley]

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Hi all,

This patch fixes the FTP transport so that it does not require atomic
rename for FTP servers.  It uses osutils.fancy_rename to implement this.

It turns out that fancy_rename does not fail safe-- if it is impossible
to delete the original file, it would leave the filesystem in an
inconsistent state.  So this patch fixes fancy_rename so that it
restores the original state on failure.

Aaron
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