Blocking bookings feature

[jbenito]

1) we will offer an interface to create blocking days (CMS weeks). This interface will ask for:

• Start/end date
• Reason/Message?
• List of rooms to be blocked
• List of users (let's call it LU from now on) who may override the blocking and book anyway (CMS secretariat)

2) once the blocks are done, nobody but LU can book for those rooms during those days (just BOOK, NOT pre-book).
3) all the already existing bookings before blocking will be rejected automatically.
4) For rooms owned by the creator (e.g. Nathalie Bleesz and 40-x-x) of the blocking the blocking will be approved immediately.
5) For rooms owned by someone else (e.g. those other rooms that you use during CMS week but they are not yours) the owner will be notified and has to approve (or reject) the blocking request. In case of approval, all the existing bookings will be rejected.
6) When creating a booking, approved colliding blockings will be displayed in the availability table. Depending on if the user is allowed to book over the blocking a different color will be used.
7) a dedicated calendar should be available for the blocked rooms

[Adrian Moennich <jerome.ernst.monnich@…>]

In [fb6f283b59124868cd5bb8b1f6c3be95ad93da35/indico]:

[FTR] Add room-blocking system

• also add jQuery and jQuery UI
• fixes #667