[GiNaC-list] GiNaC release 1.5.7

Hi everybody, GiNaC 1.5.7 is out and available. The changes are: * Fixed a bug in the GCD code (infinite loop in pgcd()). * Fixed a bug in atan2() (division by zero error for atan2(x,0) if x is a negative and composite term). * Products now correctly set info_flags::negative and info_flags::negint. As always, this release can be downloaded from http://www.ginac.de/Download.html Best wishes, Jens