* wrap/python/cgi/Makefile.am, wrap/python/cgi/ltl2tgba.in,

wrap/python/cgi/README: New files.
* wrap/python/Makefile.am (SUBDIRS): Add cgi.
* configure.ac: Output wrap/python/cgi/Makefile.

wrap/python/cgi/README

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+ltl2tgba.py is a CGI script that translate user-supplied LTL formulae
+to Transition-based Generalized Büchi Automata.
+
+You have to install the script yourself if you want to test it.
+
+1) Install Spot first (run `make install' from the top-level).
+
+   The CGI scripts uses the Python bindings and assume they
+   have been installed.  Near the top of the script, you
+   should see a call to sys.path.insert(), with the expected
+   location og the Python bindings for spot.  This path was
+   configured from ./configure's arguments and you should not
+   have to fiddle with it.  I'm mentionning it just in case.
+
+2) Copy ltl2tgba.py to some place were CGI execution is allowed.
+   Depending on your HTTP server's configuration, you may have
+   to rename the script as ltl2tgba.cgi or something else, so
+   that the server accept to run it.
+
+   Apache users in trouble should look at the following options
+   before digging the Apache manual deeper.  These can go
+   in a .htaccess file (if allowed).
+
+      # Treat *.py files as CGI scripts
+      AddHandle cgi-script .py
+
+      # Allow CGI execution in some directory.
+      Options +ExecCGI
+
+3) In the directory where you have installed ltl2tgba.py,
+   create a subdirectory called spotimg/.  This is where
+   the script will output its images and other temporary
+   files.  (If you want to change this name, see the imgdir
+   variable at the top of the script.)
+
+   This directory must be writable by the Unix user that
+   will run the script when the HTTP server processes the
+   request.
+
+   ltl2tgba purges old files (>10min) from this directory 
+   each time it runs.