This implements the same proxy behavior as per http.DefaultTransport
using HTTP proxies as directed by the $HTTP_PROXY and $NO_PROXY (or
$http_proxy and $no_proxy) environment variables.
Prefer to have widgets force a draw when their data changes. This should
reduce draws (unless the user has a module installed that updates >=
1/sec, the old draw default).
This should also remove a source of some of the race conditions that
users were experiencing (though not all, there are still many).
