comment for the pl_leg function says that it returns 0 if n exceeds the...
comment for the pl_leg function says that it returns 0 if n exceeds the maximum Legendre order, but I don't think this was actually implemented, so I added it. I also changed the Fourier function to by default calculate A for the more common case of n > 0, and only calculate if n=0, instead of the reverse. Refs #8
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