Ann: SWI-Prolog 6.6.4

Hi,

I have uploaded SWI-Prolog 6.6.4. This is mostly for MacOS, where
building using Macports failed and library(archive) was not properly
packed in SWI-Prolog.app.  Some last minute enhancements made it into
this release as well.

	Enjoy --- Jan


========================================
SWI-Prolog Changelog since version 6.6.3
========================================

  * ENHANCED: Interrupt handling

  * ADDED: Interrupt handling: 's' to print the C-stack (if libunwind or
    some alternative is around).

  * MODIFIED: Print debugger interaction to user_error instead of
    user_output.

  * BUILD: Consider configure out of data if there is a newer aclocal.m4

  * ENHANCED: DO not start tracer from forced interrupt (may crash)

  * ENHANCED: Handling of abort from ^C inside readline().

  * ENHANCED: Try harder to exit cleanly if errors arrise.

  * FIXED: Merge error with map_bits/2

  * FIXED: Also get Exit at the bottom of the Qt console File menu

  * FIXED: swipl-ld must dispatch shared objects as liraries to the linker.


===============
Package archive
===============

  * PORT: MacOS: use MacPort libarchive because MacOS is not a compatible
    library.

=================
Package swipl-win
=================

  * BUILD: Avoid including packs in the app.

  * FIXED: Also add (recursive) dependencies for the .dylibs we copy from
    MacPorts to the app.

============
Package xpce
============

  * PORT: Avoid ending up with c89 as local compiler on MacOS