Re-add 0.6.0 release notes.

RELEASE

@@ -160,8 +160,7 @@ We now manage the project using SourceForge:
     http://sourceforge.net/projects/scsh/
 
 * New in this release
-====================
-
+=====================
 
 ** API changes
   For sre's, BOW, EOW, WORD, and WORD+ (which were already unsupported
@@ -172,6 +171,63 @@ We now manage the project using SourceForge:
   Most of the the known bugs of version 0.6.0 have been fixed. See the
   project page on SourceForge for a list of the remaining known bugs.
 
+* New in 0.6.0
+==============
+
+** Scsh is now based on Scheme 48 0.53  
+  With the move from Scheme 48 version 0.36 to version 0.53 in this
+  release the underlying system received a massive update. The most
+  significant changes include:
+    User level threads
+    Advanced garbage collector
+    Improved foreign function interface to C
+
+  The most significant change for Scsh users is the addition of a
+  user-level thread system. Scsh provides various features to deal
+  with this new power in a system programming environment: An event
+  based interface to interrupts, thread local process state and
+  thread-safe system calls.
+
+** A manual for Scheme 48 has been included
+  Richard Kelsey, the author of Scheme 48, has graciously allowed us
+  to retrofit the current Scheme 48 manual for inclusion in this scsh
+  release.
+
+** Interfaces to dot-locking, crypt and syslog
+  Scsh now provides advisory file locking via the dot-locking scheme
+  and a direct binding to the crypt function. Furthermore we added
+  a complete, system-independent and thread-safe interface to syslog.
+
+** API changes
+  Some features of the previous releases are currently not
+  supported as we did not have the time to implement them. Please tell
+  us, if you can't get along without them. Here is a listing of these
+  currently dereleased features:
+    select
+    select!
+    ODBC support
+    bufpol/line
+
+  The following procedures received new names in this release:
+    sleep (now process-sleep)
+    sleep-until (now process-sleep-until)
+
+  network-info, service-info and protocol-info now return #f on non-success.
+
+  The default directory for creating temporary files has changed: It's
+  now the value of $TMPDIR if set and /var/tmp otherwise.
+
+  The nth procedure is still there but is now officially obsolete.  It
+  will go away in a future release.
+
+** HTML version of the manual
+  There is now a HTML version of the scsh manual generated by tex2page
+
+** Bugfixes
+  Most of the known bugs of version 0.5.3 have been fixed. See the
+  project page on SourceForge for a list of the remaining known bugs.
+
+
 
 * Thanks
 ========