How to eliminate the "zombie" JSmols that persist when the number of JSmols changes:
Reload the page (which includes the chapter in the URL already), specifying the view as ?v=#

Am I already using query somewhere? YES I already had getInitialViewNumber() in util.js
but it was unused. Now it is called in showInitialView which sets the initial view to display (ivn)
in multiJmolClick(ivn).

body onLoad: initChapter() -> showInitialView -> multiJmolClick(ivn)

multiJmolClick(0) changes 0 to 1.


In writeJmols()
When currentJmolCount != jmolCount, reload with ?v=#
  location.reload() does not allow adding a query parameter.
	location.pathname returns the current pathname without http://.
	>> location.href returns the current URL with http://.
	location.assign("url") loads a new document, keeping the old one in the history for "back".
	>> location.replace("url") loads it, erasing the current url from the history, so no "back".

In initChapter() I need to set currentViewNum? from ?v=# query parameter
Then in showInitialView I need to call multiJmolClick(currentViewNum)