Use the same popup template (now fixed to show units correctly) for various cost maps.
Reformated (mostly white-space changes) for readibility.  Strictly transparent changes.
Got downloaddata function working, connected it with restored download
button, and removed now-unneeded download menu.
Make downloaddata a no-op if user is not logged in.
Restored changes to template ids made in commit ca0982f44d93655f759322350e934675dc559ceb that were accidentally lost in commit 5501a0ffcb460cecacf736c430f5ce9ca42534e3.
Put select control where heading was, make heading invisible (except to screenreaders) and tweak styles.
Change initially-displayed map to Switchgrass Yield (county).