Design and implement UI transactions for connections between data entities for the OMERO data

This is the UI layer issue for data_harvesting#78

From OMERO images, I get two types of entities now: Image and Imaging Instrument (Microscope + Detector + Objective).

Ideas for more connectedness in the data:

• connect images and the instruments involved in their creation
• connect image owner name / research group to the "Institute" and "Experts"
• create Datasets / Projects for images in unHIDE to represent OMERO Datasets / Projects
• connect images to the publications
• extract sematic entities from text (using ontologies / Named Entity Recognition), and use them to connect the data