[S] Bug fix for weights argument in fda()

[Michael Ostland <ostland@stat.berkeley.edu>]

The fda() function in the Flexible Discriminant Analysis
package has a bug when one tries to specify the "weights"
argument.  Trevor Hastie suggests the following fix:

> Replace the line near the top of fda (that looks almost like this one)
> with:
> 
>     m <- m[match(names(m), c("", "formula", "data", "weights"), 0)>0]
> 



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