legendre.m is not updated in windows distribution.

[kruvalig]

I install octave 3.0.3 under windwos. And found that in  
share\octave\3.0.3\m\specfun\ placed old version of legendre.m. In this  
maillist was discussion, and as result of it was function with  
normalization. I don't have enough experience to update it. Could anybody  
to change this function to this:
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