Columbia server does not serve up proper
opendap DDS replies. The Dataset {...} name
changes depending on if the request has certain
kinds of constraints.
Code for a hack was not being used, so restore it.
The fix is to effectively ignore differences in
Dataset node names if the code is coming from
columbia.edu.
2. [NCF-278]
The ncgen code is improperly typing int64 integer constants
as uint64.
3. [NCF-279]
Empty string constants were not being properly
filled when their target array is length 1 or more.