Info on SSE2 support.

        created socket to a local address

    - Added UNIX:UNIX-OPENPTY, an interface to the openpty C library

      function.

    - SSE2 support added for x86.

      o CMUCL automatically detects whether sse2 is supported or not

        and loads up the appropriate core file.

      o New -fpu switch allows the user to specify explicitly which

        core should be used.

      o Fasls compiled with sse2 support have the extension sse2f.

        Otherwise, the normal x86f extension is used.  This allows the

        user to do tests/experiments with both x87 and sse2 without

        having to mess around with different directories and removing

        fasls before building for a different FPU.

  * ANSI compliance fixes:

    - Fix bug in backquote printer.  If the variable is @foo, we want