yet another gnome-vfs patch

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I still don't know if/where my patches will go, but that doesn't prevent me from trying to improve gnome-vfs and nautilus remote file browsing.
Today's patch is for the ftp method. It invokes the "simple-authentification" callback when it failed to login using the provided username/password. That way, if login failed, nautilus asks for a valid username/password. This patch is not perfect since the uri isn't modified to take into account the username/password the user entered because I don't know if I'm allowed to modify the uri provided by the user from a gnome-vfs module.

Christophe
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