Fix performance issue that aggregation cache not used for coverages #1317
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The aggregation cache for join existing aggregations stores coordinate information so that all files don't need to be opened on every request. For this cache to be used,
NetcdfFile.locationmust be a non null value. This PR ensures thelocationis not null when an ncml dataset is opened as a coverage (for instance with NCSS).Use this change in the TDS: Unidata/tds#475