v3.3.1, v3.4.1, v3.5.1, v3.6.1

This release uses scalaxb's --named-attributes option to make working with the generated NITF classes easier. It also adds default tag labels to the objects so that one doesn't need to specify the tag label explicitly when constructing a scalaxb.DataRecord.

Unfortunately, fixed attributes were generated as parameters with no default value, so this release is harder to work with. I suggest using either v3.X.1 or v3.X.2.