K-Fêt - Statistics
New base class - StatScale
- create scale, given chunk size (timedelta), start and end times
- get labels of
- get start and end datetimes of chunks
DayStatScale: Scale whose chunks interval is 1 day
WeekStatScale: same with 1 week
MonthStatScale: same with 1 month
AccountStatOperationList: manifest of operations stats of an account
- renamed from AccountStatLastAll
- updated according to SingleResumeStat
AccountStatOperation:
- renamed from AccountStatLast
- remove scale logic with use of StatScale objects
- used scale is given by `scale` and `scale_args` GET params
- add filter on operations types with `types` GET param
AccountStatLast(Day,Week,Month) are deleted ("merged" in
AccountStatOperation)
