Changing number of seats in seating

[larserikgk]

It should be able to dynamically change the number of seats in a seating in case mistakes are made during creation. Current situation is that seating must be deleted to change number of seats as the seats for each seating are only created upon creation of a seating.

Options to consider:

• If all seats are empty you can add or remove as many as you want.
• If some seats are taken, add or remove as many you want, but remove reservations and notify users that they must reserve seats again.
• If some seats are taken, only empty seats can be deleted, and not so many that users lose their seats. Users should be notified that the seating arrangements might have changed. Least invasive, and possibly the best solution.

[HON95]

It's currently possible to manually create and delete seats, so seat count changes are somewhat possible.