Update to version 4.2.8.  Changes:

 -  Fixed infinite loop when a character is output to a port
whose character encoding does not support the character (e.g. (display
(integer->char 1000)) when character encoding is ISO-8859-1).
 -  Added procedures to extract the threads and thread
groups contained in a thread group (thread-group->thread-list,
thread-group->thread-vector, thread-group->thread-group-list,
thread-group->thread-group-vector).
 -  Renamed open-process' show-window: setting to the more
reasonable show-console: since it controls the visibility of the
console.
 -  Added readtable-max-unescaped-char and
readtable-max-unescaped-char-set which control the external syntax of
characters in symbol, string and character objects written with the
write and pretty-print procedures.
 -  Added tcp-server-socket-info to get the IP address and
port-number of a tcp-server-port (useful when the server port was
created with a kernel assigned port-number, i.e. setting port-number:
0).
 -  Fixed incorrect calls to ___P macro in lib/*.c, and added
lib/check___P script to automatically detect such calls (script
contributed by Derek Peschel).
 -  Added a "terminate" interrupt which terminates the Gambit
process cleanly (all the exit jobs are executed before exiting). On
Unix this interrupt is raised by the SIGTERM signal so a "kill 1234"
where 1234 is the pid of the Gambit process will terminate the process.
On Windows the interrupt occurs when the console window is closed or
the system is shutting down (however currently the system hangs while
executing the exit jobs).
 -  Fixed handling of incomplete characters at end-of-file,
which are now handled like illegal characters (error signaled unless
char-encoding-errors setting is set to #f).
 -  Fixed recently introduced bug in handling of end-of-line
encoding.
 -  Added escaping of non-graphical characters in symbols:
(string->symbol (string (integer->char 255))) gives |\377| .
 -  Protect gcc extension _builtin_expect with GCC version >= 3
because old gcc versions (up to 2.95.3 it seems) did not have that
extension.
 -  Added char-encoding-errors: setting to open-file to
enable/disable character encoding error checking, and -:fr and -:fR
runtime options to select the default setting for file I/O (on/off).
 -  Removed non-ASCII characters from lib/_num.scm .
 -  Fixed error introduced with end-of-line encoding of the history
file.
 -  Changed end-of-line encoding from lf to cr-lf when reading
source code. This makes the load procedure and the compiler more lenient
when reading source code with non-Unix-style end-of-line encoding. This
means that source code with a string containing a CR/LF sequence will
construct a string with a single #\newline character (previously both$
#\return and #\newline were put in the string).
 -  Fixed compiler crash when compiling files containing the forms
#123, #, ##, etc (file location information was not properly attached to
expression)
 -  Improve error messages produced by the C compiler when it
compiles a file generated by a different version of the Gambit compiler.


(bjs)