broadway: Track surface position correctly

broadway: Track surface position correctly

surface->x/y (and various x,y arguments) should be in the parent
coordinates, so treat it as such. We also keep track of the root coords
as these are needed for popup positioning.

Also, drop the isTemp property server side and the weird initial
placement at (100, 100) in the daemon. We now fully control window
placement from the client instead. If this is not we want we should do
a serious design for that but until then lets do the simplest thing.