[Bf-python] unique key for faces

[Tom Musgrove]

Thanks Toni,

actually I used the face on my first attempt and was getting a key error, 
and so wrongfully assumed that I couldn't use the face as a key.

Then I figured out my key error (I was trying to delete a nonexistant key - 
doh!), and forgot to try it again using face (instead I was using the 
face.normal which worked for my purposes).

Tom M.

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