Users should be able to choose as many or as few folders to link as they need. However, we should probably disallow selection of both the parent folder and the child.
Scenario comes from RLA, where one big folder contains thousands of sub-folders, which are too many to ingest at once given memory requirements.. So users will want to select a range of the sub-folders and link them all within one project.
Just finished this one. The menu option for linking is the same, but it is also listed under the "Import..." menu. That is because I've refactored the "Link Originals" dialog into a one page wizard. It is easier to choose a starting place in iRODS or the file system now, then pick parts of the tree to link from there. Many parts can be selected, so the user can hopefully save some time.