[GiNaC-devel] Improvements to function abs and power::info

[Vladimir V. Kisil]

	Dear All,
	
	I propose a tiny patch, which shall improve evaluation in
  GiNaC. abs() now can evaluate conjugates and step function. Power with
 real base and even-integer exponents reports that it is
 non-negative.

 Best wishes,
-- 
Vladimir V. Kisil     email: kisilv at maths.leeds.ac.uk
                        www: http://www.maths.leeds.ac.uk/~kisilv/
Book: Geometry of Mobius Transformations
http://www.worldscientific.com/worldscibooks/10.1142/p835
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