"only my bookings" - check for creator, too
Fix UTF8/unicode handling in JSONRPC services

Old ones need UTF8...
Reservation.is_confirmed => is_accepted
Get rid of is_work_day and some unused functions
Change code style for Setting model
Make some nullables more sane and rename a backref
Remove relative imports (except in __init__)
Get rid of roomClass - there's room.kind for it
Remove useless comments/docstrings