Allow excluding a column from the resulting view for Information Links

When loading data from SQL or other external sources, the right hand panel labeled "Columns in Selected View" allows users to unselect fields that are not needed in the analysis.

When loading data from an information link, the user is required to load all fields included in the link. There is no option to unselect fields. Having the ability to unselect fields that are not needed would optimize data loading without having to clutter the library with custom information links.

This is preferred over, for example, an "Exclude Columns" transformation, as the unneeded view doesn't have to first be loaded in order to remove it -- it's just left out from the load query altogether.