Redturtle.prenotazioni

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- Add booking_type vocabularies for portal_root
[mamico]

- Improve manager mail notification subject to include also name and date.
[cekk]

- Update the min booking type length value to 5min.
[folix-01]

- Fix: hidden attribute in tipologia
[mamico]

- Fix upgrade step error 139
[mamico]

- Add flag `auto_confirm_manager` that allows to automatically confirm bookings created by Booking Managers.
[cekk]

- Booking Managers bypass futureDays checks when create new bookings.
[cekk]

- Remove duplicated method in booker: create. Now there is only `book`.
[cekk]

- Hide PrenotazioniYear in add menu for restapi.
[cekk]

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- Contributors can add PrenotazioniFolder.
[cekk]

- On PrenotazioniFolder upgrade-step (2000->2001) migrate also requirements field.
[cekk]

- Fix gate chooser algorithm to avoid overlaps. Now we randomly choose it without getting the less used one.
[cekk]

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- Do not raise Unauthorized when translate title ical adapter.
[cekk]

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- Fix message composition in manager notification.
[cekk]

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- Set PrenotazioniFolder and PrenotazioneType as not searchable (types_not_searched).
[cekk]

- Send ical also for manager notifications.
[cekk]

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- Do not send the booking created email if auto_confirm is true and notify on confirm is true.
[folix-01, cekk]