Released USBNet 0.52.N

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This is the one
we were talking about! So, here comes the full OpenSSH suite, and not just the sshd server anymore. Plus, sshfs

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In case people were using scp programmatically: I switched the scp symlink to point to OpenSSH's scp instead of dropbear's.
I'm assuming people know how to use sshfs, but just a couple of notes:
* The target's hostkey needs to be known, so you need to connect to it once with ssh.
* On FW 2.x (at least, possibly 3.x too), fusermount -u returns a completely idiotic error and doesn't unmount anything. umount works fine.
* On FW 2.x (& possibly 3.x), you'll have to stop netwatchd to prevent it from killing your outgoing connections.
Thanks to twobob for pushing everyone to look at this, I now have something to back my usual 'try sshfs!' response when people ask for a way to access remote storage from their Kindle

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