#335 gfactor(2) wrong (no Gaussian integer factorization)

[Stavros Macrakis]

gfactor(2) => 2; similarly for gfactor(5), etc.

Correct result is (1+%i)*(1-%i) etc.

Same thing for factor(2,q^2+1) -- but note that
factorization isn't necessarily unique in this case, e.g.
factor(6,q^2+5)=2*3=(1+q)*(1-q).

This appears to be a documentation bug (although it
would be nice to handle gaussian integer factorization).
Factorization of integers is special-cased in the code,
but there is no special case for factorization of gaussian
integers. There do exist simple algorithms for this.
Perhaps I'll implement one someday....

Maxima 5.9.0

[Robert Dodier]

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Need to change documentation for gfactor per comment above.