[Support #OWG-677920]: aggregation

1. use DBZ in your aggregation, try it again (restart TDS to make sure cache is 
cleard)

if it still doesnt work:

2. send me the openDAP DDS, and the catalog. 

3. check for errors in the logs.

Ticket Details
==================
Ticket ID: OWG-677920
Department: Support THREDDS
Priority: Normal
Status: Open