1.5.0 (<date>)
* Added polynomial factorization.
* Added an additional (recursive descent) expression parser.
-* gcd now allows the user to override (some of the) heuristics.
+* Faster GCD computation.
+* gcd() now allows the user to override (some of the) heuristics.
* Replaced custum RTTI by standard C++ RTTI.
* Definition of archiving methods now optional when declaring a new GiNaC class.
* Fixed recursion in polynomial divide that caused a significant slowdown in