Commit Briefs
void-ify some functions
their return value is no longer used, it's only confusing at this point.
refactoring state management
instead of having a flag to discern between two different behaviours in S_SENDING, split that state into S_SENDING_FILE and S_SENDING_CGI (this will also make it easier in the future to add other sending states). While there, also get rid of `goodbye' and make start_reply advance the state machine by itself.
fix redirects
make sure redirect starts with /. This also requires a tweak in check_path, in the case we go open_file -> send_dir -> open_file -> check-path and the path starts with a slash.