[fprint] U.are.U SDK driver

[Preston A. Elder]

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I have written a U.are.U driver against Digital Persona's official SDK
for their U.are.U devices.

I did this so I could get my DP5160 working.
This driver DOES work.  Additionally, theoretically it should work for
any UareU fingerprint reader, now or future.

I first tried making this driver using the image capturing interface on
it's own (ie. as a devimg), and I got it working, but not as reliably
as I would like.

Using the device itself for figuring out minutae and doing the
verification of the fingerprint seems to work much better.

I somewhat arbitrarily decided that when you register your finger you
need to register once and then verify it twice (and the registration
process will take the highest quality of the 3 attempts and use that
for what gets stored).  Additionally I decided that 3 failed attempts
to match a single fingerprint during enrollment is a failed enrollment.

This DOES NOT contain any intellectual property of Digital Persona, it
merely implements against their API.

I've attached the patch file for this to work.  Feel free to merge it
with the mainline.

Preston.
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