need ability to add data types other than dataTable (spatial)
Currently, only dataTable data types can be properly added to a data package,
using the Data Table Wizard (other data types can be added, but as a hack).
There is a need for support for adding data types other than dataTable, such as
gifs, jpegs, pdfs, etc. Maybe an attach feature would be useful, or other
wizards for these other types of files where you can add the data file, and the
metadata specifically relevant to that data type.