* wrap/python/cgi-bin/ltl2tgba.in (dot): Use the value computed by
configure.
(os.system): Cleanup stale files only when the form has been
submitted.
(list options): Keep track of the selected value.
(draw_acc_run|print_acc_run): set ec=0 to detect if it has been
later set or not. Fix error message when using generalized
automata with degeneralized emptiness checks.
* wrap/python/cgi-bin/Makefile.am (ltl2tgba.py): Substitute @DOT@.
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.