[Retros] Add units: 17th update (N1RAl)

[Mu-Tsun Tsai]

> In this case we can decrease to 12 pieces.

>

> N1RAl(12 pieces)

> Thierry LE GLEUHER

> 7B/6pP/6N1/7P/6PP/5NNk/7P/6K1


Looks fine but there's a little problem that this is not a legal position,
so it should be in the category of "N1RAi" (which is currently empty), not 
N1RAl.


Mu-Tsun