Update to version 9.4.2.

   Notable changes in this latest version are listed here. Some code
   cleanup work and documentation editing has also been done.

  256-color limit removed

   Icon's X-windows interface previously limited each window to 256
   colors at one time. This limitation has been removed for the TrueColor
   displays provided by most modern computers. Median-cut quantization is
   used to select 256 image colors when WriteImage() is called to write a
   GIF file.

  Library changes

   As usual, several files in the Icon program library have been added or
   edited. The core library files, however, remain stable.

  Minor changes

     * The command "icon - [args]" can now be used to execute a source
       program read from standard input.
     * A new "icont -N" flag suppresses embedding of an iconx path in the
       generated executable
     * The configuration directory has been restructured.
     * Several obsolete configurations have been removed.
     * The environment variables HEAPSIZE and BLOCKSIZE no longer
       function as undocumented alternatives to BLKSIZE. The GNU ls
       utility uses BLOCKSIZE for other purposes, leading to confusion.
     * "make Install" has been changed to never delete anything. It now
       creates a new directory rather than altering an existing one.

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