Ann: SWI-Prolog 5.4.0

The SWI-Prolog 5.3.x development cycle has been consolidated in version
5.4.0, which is available for download from http://www.swi-prolog.org

Here is a brief summary of new bundled functionality:

* Attributed variables
* Global variables
* Coroutining (freeze, when, dif)
* CHR (Constraint Handling Rules)
* Integer bounds constraint solver
* JPL: a bi-directional Java interface (not yet on all platforms)
* SSL (Secure Socket Layer) interface
* Multi-threaded HTTP server and client libraries
* Frequent binary releases for MacOS X (next to Windows and Linux)
* Many patches ...

With many thanks to those who contributed with packages, help,
bug-reports, sponsored development and donations.  In particular
Tom Schrijvers and Bart Demoen who provided advice for implementing
the kernel features to support constraints.  Tom implemented the CHR
compiler and the bounds.pl constraint solver.

Enjoy

--- Jan