Copy 11194 and well hierarchy 10075

Two minor issues fixed here:

- http://trac.openmicroscopy.org.uk/ome/ticket/11194 Test by right-click on an image in webclient Tree: Edit > Copy. Then right-click on Dataset - the Edit > Paste option should be enabled. Paste should place the Image into this dataset.

- http://trac.openmicroscopy.org.uk/ome/ticket/10075 Test by searching for an image that is in a Screen/Plate. Select the image in search results and in the bottom of the right panel, click 'Load hierarchy...' Should see a tree with Plate and Screen (if Plate is in a Screen). Clicking the Plate / Screen should refresh webclient to show you the item in the tree.