Make it possible to use the cgi script without installing a web
server. * wrap/python/cgi-bin/ltl2tgba.in: Starts a web server if the script is not called as a CGI. Arrange to load libraries from the build directory. Create the spotimg/ if needed when run as a web server. * wrap/python/cgi-bin/Makefile.am: Adjust build rule and clean the spotimg directory. * wrap/python/cgi-bin/README, NEWS: Update.