PLOTT_WDA will make a light curve plot for all channels using either the index or
roadmap. The second `T' signifies that it is a time plotting routine.
Seven plots are made, one for each channel. Some sample calls are:
IDL> plott_wda, index
IDL> plott_wda, roadmap
IDL> plott_wda, roadmap(100:200), psym=10