Added low dimensional sample IDs to gridview
Dragging categorical folder into gridview now shows correct information

Issue raised in SAN-94: due to changes in the core-db, the query to
retrieve information for all nodes under a folder had to be changed.
Merge pull request #20 from thehyve/features/UAT-10-sample-identifiers-in-grid-view

Features/uat 10 sample identifiers in grid view