[Axiom-developer] [#47 complexForm(log(%i) - log(-%i))] Usual sign convention

[kratt6]

Changes 
http://page.axiom-developer.org/zope/mathaction/47ComplexFormLogILogI/diff
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Dear William,

I think that the "usual sign convention" is a bad idea. 'myatan2(x,y)' should 
return unevaluated, since there is no way of knowing in which quadrant 'x+%i*y' 
is. That's why I proposed 'OrderedRing', in which case the answer is clear. We 
would have to think of the case of members of 'COMPLEX EXPR INT' where we 
happen to know the quadrant.

Martin
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