Add a "Create Template from Instance" ability. Basically, you can
create a new template (well, really a modify) from the current swapped in experiment. This allows you to create a template, swap in an instance, modify the datastore in the instance (which is a copy of the datastore in the template), and then create a new template using the datastore and nsfile from the instance. This is a new menu item on the showexp page for the instance. Also in this commit are fixes and improvements to the new navagation bar that I recently added.