[GiNaC-list] Release GiNaC 1.5.3

[Jens Vollinga]

Hi everybody,

GiNaC 1.5.3 is out and available. The changes are:

* The parser now understands user-defined functions by default. The
   parsed identifier names can now contain underscores.

As always, this release can be downloaded from

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

Best wishes,
Jens