[#333 asin 1.0 over Complex Float fails] patch possible.

[Francois Maltey]

Changes http://wiki.axiom-developer.org/333Asin10OverComplexFloatFails/diff
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I propose to remplace in asin x == atan (x/sqrt(1-x**2)) in trigcat.spad line 
162 by

       asin x ==
         x=1  => 2*atan 1
         x=-1 => -2*atan 1
         atan(x/sqrt(1-x**2))

The result seems right...
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