Importing season tickets

Season ticket → Import works like the ticket import for a fixture.

1. Where they sit — the floorplan, stands and room, counted across every event of the season ticket. A list that does not fit is refused before anything is made.
2. What the ticket says — price category, discount (100 % makes an invitation), design and payment method.
3. The list — first name, last name and email; optionally QR codes in column D (duplicates skipped), and Email everybody their ticket.

A row without a valid email still gets its ticket but no mail, and does not become a contact.