Fix bulk downloads.
When the full appliant display was modified to include tags and status the bulk download csv was not fixed.
Rewrite Preview Links
All links go through the absolutePath method so when we are in preview mode we can rewrite these and then redirect throught he Preview controller.
Force the user to create a unique name for their display
This isn't enforced anywehre but in the UI since it is not necessary for names to be unique, it simply avoids confusion when the user is creating a download display.