Scrap the live-build code.  Separate client from controller dirs.
New zmq-based worker and controller and watchdog.
this watchdog might actually work
Tweaks to tor-browser package:

 * delete the bundled copy of OpenSSL so the system version (which is
   compiled with enable-ec_nistp_64_gcc_128) will be used
 * fix another assumption that cwd = /usr/lib/tor-browser in start-tor-browser
More robustness for worker and controller. Belated gitignore update.
More sophisticated link traversal from initial site set.