IMPROVE: Refactor LeftMenuView
ADD: AccountDataService
ADD: AccountRepository
IMPROVE: Use Spring Data JPA 1.4M1 for countBy support
ADD: AccountDataService test
ADD: DashboardDataService test
ADD: Security context for test
FIX: SQL import for tests
IMPROVE: UserService tests, use security context
FIX: DashboardData service, continu method implementation
FIX: Account entity, remove owner unicity