+153) Catch SIGINT and use it to close the listen socket, serve
+ remaining connections and shut down. This would allow higher
+ uptime and make testing more convenient.
+
+154) Underline links in docs and cgi pages. More precisely,
+ don't mess with the browser defaults for link underlining.
+
+155) The sig_handler() shouldn't call log_error().
+ While it isn't known to cause actual problems in normal operation,
+ it's technically incorrect and causes crashes when running in
+ valgrind.
+
+156) Reject socks requests with an explicit error message similar
+ to the one used for ftp. Motivation:
+ https://lists.privoxy.org/pipermail/privoxy-users/2017-March/000195.html
+