[issue1640] Enhancements for mathmodule

[Mark Dickinson]

Mark Dickinson added the comment:

Christian: would it be possible for you to tell me what the argument of the 
log1p call is on Windows in that last branch of c_atanh, for the testcase 
atanh0022.

On OS X I get:

Input to log1p is 3.2451855365842669075e+32

It's hard to imagine that there's anything wrong with log1p here, since all 
it does for a large input like this is compute log(1+x).

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