triggerUpdate in Wt

[Michael Backus]

It is possible to push updates from Wt to a webpage using either triggerUpdate or server::post. The broadcase and serverpush examples show how to do this from within Wt, but I'm not sure how to go about triggering a Wt function from a thread completely separate from Wt. If I can figure this out, then I can replace the timeout function and generate frames as fast as OpenCV can create them. It should also make compartmentalizing the various threads the program will eventually employ a little easier.