Modified ArrayAggregateOnOuterDimension::serialize() so it works!
Modified ArrayAggregateOnOuterDimension::serialize() so it works!

The new code handles the case when code in GridAggregateOnOuterDimension
calls ArrayAgg...::read(). We can fix teh GridAgg... code later but this
gets all the tests working and the improvement of interleaved reads and
writes in place for at least the tests for 'pure' arrays. (join new
aggregations only).

OPENDAP/ncml_module,OPENDAP/ncml_module,OPENDAP/ncml_module,OPENDAP/ncml_module,OPENDAP/ncml_module