Bug in complex::norm

[Gabriel Dos Reis]

Maurizio Loreti <loreti@pd.infn.it> writes:

| > Is complex<T> required to work with non-floating point types T?
| 
| No.  ISO/IEC 14882:1998 2.6.2.2 states:
| "The effect of instantiating template complex for any type other than
| float, double and long double is unspecified."

Thanks.  

I don't recall if I changed norm's implementation, and if so I don't
recall why.  But we should have a less inefficient implementation.

-- Gaby
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