Deep directory structure in daily RDAHMM KMZ files are removed

The KMZ files generated by the daily RDAHMM result service used to have a deep directory structure because of the way "zip" is used. We have changed this so that the KMZ file now only contains a KML file. We also changed the file name extension from .kml.zip to .kmz so that users can directly open it with Google Earth. We plan to further change this in the future so that the KMZ will contain one top level KML and a set of sub level KMLs.