Return own tab for wall. Improve Wiki nav. Removed attachments listing page

app/contexts/projects/create_context.rb

@@ -32,6 +32,9 @@ module Projects
         @project.namespace_id = current_user.namespace_id
       end
 
+      # Disable wall by default
+      @project.wall_enabled = false
+
       @project.creator = current_user
 
       # Import project from cloneable resource