Bug #794385 - Implemented as a checkbox on the institution details
page. This checkbox is disabled if the site wide setting is not set.

Additional method on the User class that returns true if any of
the institutions that the user belongs to allows public views.

Change-Id: I0d58d1056efb0d84eb5ee092c4ee2db978853ce6
Signed-off-by: Darryl Hamilton <darrylh@catalyst.net.nz>