Typo in migration_to_sqlalchemy
Add Room.set_attribute_value

Also:
* Add __repr__ for RoomAttributeAssociation
* Rename Room.update_name
Rename Location.getAttributeByName()
Migrate Holiday

* New table holidays
* Holidays stored per location
* Add Alembic revision
* Remove old HolidaysHolder
Update FoundationSync call
Fix room_occupation script
Rename script to room_occupancy
Fix available rooms filter
Remove unused imports
Add qtip on disabled booking buttons
Highlight conflict checkboxes in booking pages
Fix long room/location names in roomselector
Increase label width for fitting French strings
Fix different rendering in French
Make encode_if_unicode deal with unicode LazyProxy
Add unicode to Field label text in Forms
Update roombooking http_api docs
Post-WIP fixes