Search image id 12151

https://trac.openmicroscopy.org.uk/ome/ticket/12151

Allows you to enter the ID of an Image (or other objects) in the web search.

To test:
 - Get the ID of an image and put it in the top-right search field in webclient, Enter
 - You should see the image at the top of the search results (with any other images that are found in the regular search below).
 - Once in the search page, you can do the same for Projects, Datasets etc by using the check boxes in the search form.
 - In the results panel, there is now a "Browse" link for every object which should take you to that object in the hierarchy view.