[wp-hackers] Upgrade instructions fatally flawed for Mac

[Charles]

> [Viper] You need a better FTP client then...

The issue is whether the "overwrite folder" behavior of the client (whether
an OS, FTP app, SFTP app, etc.) is to (1) overwrite the folder or (2)
overwrite individual files within the folder.  Even different FTP clients on
Windows that work both ways by default.

> [Elliotte] This is why the user-supplied files shoudl be more cleanly
> separated from the system files.

Amen.

-- Charles