Provisional implem for sample names in grid view

This is provisional for several reasons:

* There's no mechanism in place to associate low-dim data to samples,
  therefore what's shown is a list of all the samples (on the high-dim
  sid) that the user has, separated by commas.
* The code is a mess, and there's a tentative plan to write a common
  codebase for the grid view, the to-be-implemented export grid view
  functionality and clinical data export ("Data Export" tab).