replayshell.cc: clean up some unnecessary includes
replayshell.cc: make dnsmasq bind to the foreign nameserver addresses
dnsmasq: use dumber busy-wait. Now supports nonlocal nameservers
dns_server.cc: explicit move() not necessary
Prettify error messages and prompts
link_queue.cc: catch infinite loop when trace has only zeros
Inline SystemCall
http_proxy.cc: prettify call to Poller::poll()