Generally, opaque data operations are expected to be over 'void *' and have
now converted interfaces to do that. Update() method honors millisecond limit to dwell
time. Might want to homologate the millis/uSecs mix later....
boost::thread and the easiest path to that was to go with the 1.48 Boost release
in the 3P tree (eliminating a fork for a modified 1.45 packaging). One unit test,
the most important one, is failing in test_httprequest but that can be attended
to later. This test issues a GET to http://localhost:2/ and that is hitting the
wire but the libcurl plumbing isn't delivering the failure, only the eventual
timeout. An unexpected change in behavior.