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added site-int.fs and, more importantly, support for it.
Fixed bugs in SPARC CACHE_FLUSH

    1: You need gcc version 2.0 or later to compile gforth.
    2: 
    3: First, type
    4: 
    5: ./configure
    6: 
    7: configure has the following useful parameters:
    8:   --prefix=PREFIX         install architecture-independent files in PREFIX
    9:                           [default: /usr/local]
   10:   --exec-prefix=PREFIX    install architecture-dependent files in PREFIX
   11:                           [default: same as prefix]
   12:   --enable-force-reg      Use explicit register declarations if they appear in
   13:                           the machine.h file. This can cause a good speedup,
   14:                           but also incorrect code with some gcc versions on
   15:                           some processors (default disabled).
   16:   --enable-direct-threaded      Force direct threading. This may not work on
   17:                                 some machines and may cause slowdown on others.
   18:                                 (default processor-dependent)
   19:   --enable-indirect-threaded    Force indirect threading. This can cause a
   20:                                 slowdown on some machines.
   21:                                 (default processor-dependent)
   22:   --with-debug     specifies option -g to compile with debug info (default)
   23:    --without-debug  omits the -g switch and creates smaller images on
   24:                     machines where strip has problems with gcc style
   25:                     debugging informations.
   26:   --help: tells you about other parameters.
   27: 
   28: If you don't like the defaults for the installation directories, you
   29: should override them already during configure.  E.g., if you want to
   30: install in the /gnu hierarchy instead of in the default /usr/local
   31: hirarchy, say
   32: 
   33: ./configure --prefix=/gnu
   34: 
   35: After, configuration, type
   36: 
   37: make
   38: 
   39: If your make has trouble with the Makefile, "make gforth" might work.
   40: 
   41: If your installed gcc isn't called "gcc" (e.g., called "gcc-2.6.1"), type
   42: 
   43: make GCC=<whatever you call your gcc>
   44: 
   45: instead.
   46: 
   47: Now you can check whether your shiny new Forth system works. Say
   48: 
   49: make test
   50: 
   51: You can run some benchmarks with
   52: 
   53: make bench
   54: 
   55: and compare them with the results in Benchres and in the manual.
   56: 
   57: If everything is all right, you may want to install gforth. Type
   58: 
   59: make install
   60: 
   61: You have to make an entry in the info directory file manually.
   62: 
   63: For paper documentation, print gforth.ps (a Postscript file (300dpi
   64: fonts, i.e., it works, but does not produce best quality on better
   65: printers)), or say
   66: 
   67: make gforth.dvi
   68: 
   69: and print the resulting file gforth.dvi. You can also get the
   70: documentation in HTML format by typing
   71: 
   72: make html
   73: 
   74: 
   75: 		Preloading installation-specific code
   76: 
   77: If you want to have some installation-specific files loaded when
   78: Gforth starts (e.g., an assembler for your processor), put commands
   79: for loading them into /usr/local/share/gforth/site-forth/site-init.fs
   80: (if the commands work for all architectures) or
   81: /usr/local/lib/gforth/site-forth/site-init.fs (for
   82: architecture-specific commands);
   83: /usr/local/lib/gforth/site-forth/site-init.fs takes precedence if both
   84: files are present (unless you change the search path). The file names
   85: given above are the defaults; if you have changed the prefix, you have
   86: to replace "/usr/local" in these names with your prefix.
   87: 
   88: By default, the installation procedure creates an empty
   89: /usr/local/share/gforth/site-forth/site-init.fs if there is no such
   90: file.
   91: 
   92: If you change the site-init.fs file, you should run "make install"
   93: again for the changes to take effect (Actually, the part of "make
   94: install" starting with "rm gforth.fi" is sufficient).
   95: 
   96: 
   97: 		Multiple Versions and Deinstallation
   98: 
   99: Several versions of Gforth can be installed and used at the same
  100: time. Version `foo' can be invoked with `gforth-foo'. We recommend to
  101: keep the old version for some time after a new one has been installed.
  102: 
  103: You can deinstall this version of Gforth with 'make uninstall' and
  104: version foo with 'make uninstall VERSION=foo'. 'make uninstall' also
  105: tells you how to uninstall Gforth completely.
  106: 
  107: 
  108: 			A Possible Problem
  109: 
  110: You need to read this only if you see a message like
  111: 
  112: "gforth: Cannot load nonrelocatable image (compiled for address 0x1234) at address 0x5678
  113: The Gforth installer should look into the INSTALL file"
  114: 
  115: Gforth supports both relocatable and fixed-address images. If you load
  116: normal Forth code and save the image, you get a fixed-address
  117: image. Producing a relocatable image is more difficult.
  118: 
  119: Therefore, Gforth has only a relocatable image of the kernel
  120: (kernal.fi), which is powerful enough to load the rest of
  121: Gforth. However, loading the rest takes a noticable amount of time. To
  122: avoid this delay (which would occur on every startup), the
  123: installation procedure produces an image fixed at an address
  124: determined at the Gforth run that produced the image. This
  125: fixed-address image is loaded by default. On most OSs this works,
  126: because the first chunk of memory is always allocated at the same
  127: address. If the address changes, you get the message above.
  128: 
  129: An image address change can be caused by a change of the gforth
  130: executable, or by a change (upgrade) of the OS; in these cases you
  131: just have to rebuild and reinstall the fixed address image with
  132: 
  133: rm gforth.fi; make gforth.fi; make install
  134: 
  135: If you get such a message with a different address in place of the
  136: 0x5678 each time you try to start gforth, you cannot use fixed-address
  137: images on your OS. In this case, send us a message so that we start
  138: searching for a comfortable solution to this problem. In the
  139: meantime, start gforth with
  140: 
  141: gforth -i kernal.fi startup.fs
  142: