Fix file_column plugin to generate absolute URLs without falling over

in a heap and then use that in the user details view.

vendor/plugins/file_column/lib/file_column_helper.rb

@@ -76,7 +76,7 @@ module FileColumnHelper
     return nil unless relative_path
 
     url = ""
-    url << request.relative_url_root.to_s if absolute
+    url << request.protocol << request.host_with_port if absolute
     url << "/"
     url << object.send("#{method}_options")[:base_url] << "/"
     url << relative_path