Allocation-client subpage

[DO NOT MERGE] only for review
why looping here over pricing_objects (which are pricing objects of service-environment, for which we allocate costs)? You should use here dummy pricing object (only one!) from current service_environment (on which costs are allocated). Example:
```
...
iter_date = first_day + timedelta(days=day)
dpo = service_environment.dummy_pricing_object.get_daily_pricing_object(iter_date)
DailyUsage.get_or_create(...)
```