CORE-5014 Update path in renamed resources.

Updated the DiskResourceServiceFacadeImpl::renameDiskResource method to also set the new path of the renamed resource.
CORE-5014 Removed TreeStore#removeChildren KLUDGE.

GXT 3.0.6 fixed the bug in TreeStore#removeChildren and now removes the children from their parent TreeModel wrapper as well.
Refactor and cleanup of IPlantAnchor class.
CORE-4960
CORE-4876
CORE-4876: Continuing search-related unit test dev
CORE-4876: Ongoing unit test development
CORE-4876: Updated DiskResourceServiceFacade