Parse data file timestamps
Require minIndex to be positive
Fix warnings
Render radar site shapefiles
Detect tap events. Fix LatLon.unproject precision
Guard against null render data in renderables

Over the last few months, there have been a few reports of
NullPointerExceptions in LegendRenderable nad RadarRenderable.  I don't
have enough context to know why the value is null (it shouldn't be).
This change checks if it is null and skips the render if it is, should
prevent those crashes.
Update default database

Prepopulated database format changed, update checked in image
Tap radar sites to switch active site
Update HoloEverywhere/Action versions
Fix warnings, bugfixes