[GiNaC-list] Release GiNaC 1.5.0

[Jens Vollinga]

Hi everybody,

GiNaC 1.5.0 is out and available. The changes are:

* Added polynomial factorization.
* New, faster (recursive descent) expression parser.
* Faster GCD computation.
* gcd() now allows the user to override (some of the) heuristics.
* Writing extensions classes is simpler now:
   - Replaced custom 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 sqrfree().
* Improved lsolve() of systems containing non-numeric coefficients.
* Removed implicit conversions from cl_N to numeric.
* Improved configuration and compatibility.

This is a new branch that introduces some incompatibilities on the 
source code level! If you have defined your own GiNaC classes, you will 
have to change their definitions slightly (cf. section 6.5.6 in 
http://www.ginac.de/tutorial/Adding-classes.html#Adding-classes).

As always, this release can be downloaded from

http://www.ginac.de/Download.html

Best wishes,
Jens