Added a way to request reservations

[KiOui]

Added the following:

• An accepted field to Reservations which indicates whether the Reservation is active/accepted
• Added a form which can be used to request reservations

A way to see Reservation requests will be added once we have created the borrel application (see #172)

[JobDoesburg]

You also want to create a LogEntry for such actions, like https://github.com/svthalia/concrexit/blob/b600592fb6a79383578a2b39186c159ec1822f6d/website/registrations/services.py#L175-L181 does

[JobDoesburg]

Maybe the unaccepted reservations should be shown in a opaque color

[KiOui]

I will experiment with that

[JobDoesburg]

You decided not to do it?

[KiOui]

You also want to create a LogEntry for such actions, like https://github.com/svthalia/concrexit/blob/b600592fb6a79383578a2b39186c159ec1822f6d/website/registrations/services.py#L175-L181 does

Where for exactly? Adding a Reservation or changing the status of a Reservation? The latter is already done by Django right?

[JobDoesburg]

Where for exactly? Adding a Reservation or changing the status of a Reservation? The latter is already done by Django right?

For changing the status. I think Django will only say "the reservation has changed" but will not display it as "the reservation is approved". Not sure though

[JobDoesburg]

Apart from these 3 small comments, it looks good to me