Boost Promulgated Charms

Charms in the flat namespace are boosted above similar ones
in a user namespace.
Somehow, decay function is not working properly.
http :8080/v4/"search?text=mongo&autocomplete=1"

 "Results":
 "Id": "cs:trusty/mongodb-0", "Id": "cs:trusty/mongodb-1", "Id": "cs:trusty/mongodb-2", "Id": "cs:trusty/mongodb-3", ...

But:
http get :8080/v4/mongodb-3/meta/archive-upload-time
"UploadTime": "2014-10-13T08:23:13.232Z"

http get :8080/v4/mongodb-0/meta/archive-upload-time
"UploadTime": "2014-10-13T08:23:11.006Z"

Also, this is a reason why we should never run promulgation with --p > 1, then the revision numbers will be out of date. For LP charms we should also look at extra info about the revision change dates, but that is getting more complex as it needs to be right now.