Implement invoice calculation logic

Added multiple new (unimplemented) methods in services.
Also removed people count from Lease, it made no sense, it's actually a
measurement.
Service - energyPrice, Invoice typo fix
remote server pro testy
Change all date fields to YearMonth
Add custom user type for YearMonth

The one from jadira uses serialized instances and we need to compare
dates.
Right now the user type is set using annotation in every entity, should
find a nicer way.
část service unit testů
přesun domů
Non working version
Small changes to test deployment
oprava wtf v testu (chyba konverze DTO -> DAO)
Implement EnergyPriceDao with simple test
Implement parts of service
Many changes related to invoice calculation
I have no idea what i was doing
refactor (zvláštní balíky pro implementace)
FIIIIIIIIIIIX
kontrola validity argumentu při vytváření EnergyPrice
Fakturoid - export invoices
Occupant Rest Service - delete, test for batch
Occupant Rest Occupant - delete