Change group name (rebased onto dev_4_4)



This is the same as gh-1780 but rebased onto dev_4_4.

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Fix crash when modifying the name of a group
See https://trac.openmicroscopy.org.uk/ome/ticket/11694

To test:
 * Modify the name. 
 * When the name is saved, the new name should be displayed in the tree.
 * click refresh