New mixin: PkUrlMixin
- use with SingleObjectMixin standard django mixin (used by
DetailView...)
- `get_object` use field declared in `pk_url_kwarg` to get... the object
SingleResumeStat
- clean (part of) py code
AccountStatBalanceList
- renamed from `AccountStatBalanceAll`
- url modified
- add permission checking (only the connected user can get balance
stats manifest)
- clean py code
AccountStatBalance
- cleaner filtering management
- merge urls using this class
- clean py code
87b9db520f