kfet.statistic
- delete no longer used defs
- new mixin - ScaleMixin
- get scale args from GET params
- chunkify querysets according to a scale
Article stats
- use SingleResumeStat for manifest
- use ScaleMixin for sales
- update urls
- update permission required: teamkfet
Account stats
- update permission required: teamkfet
- operations use ScaleMixin
- fix manifests urls