Fix timing bug.  When rolling over info popups in datatable very quickly, many ajax requests would fire in rapid succession.  Then, all of the popups would render on screen at once.
Fix timing bug.  When rolling over info popups in datatable very
quickly, many ajax requests would fire in rapid succession.  Then,
all of the popups would render on screen at once.

camsys/transam_core,nycdot/transam_core,camsys/transam_core,nycdot/transam_core,camsys/transam_core,nycdot/transam_core,camsys/transam_core