Remove group during import (rebased onto develop)



This is the same as gh-2227 but rebased onto develop.

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Fix http://trac.openmicroscopy.org.uk/ome/ticket/12006

To test
 * Login as an user who is in multiple group, e.g. user-6
 * Add few groups to the display
 * Open the importer
 * Import data in one of the group displayed
 * During the on-going import, remove the group you are importing to from the display