Display a per-view list of zones in the web interface

Display a per-view list of zones in the web interface

The XSL stylesheet used by the web interface does not currently include
any element which would cause a list of zones configured in each view to
be displayed, making the "Zones" section of the web interface empty
unless some zone has been configured with "zone-statistics full;" and
queried.  Since this can be confusing, modify the XSL stylesheet so that
a list of zones configured in each view is displayed in the web
interface.