Backend should show info on frequent users and/or booking statistics

[flegfleg]

Originally reported by: Ralph W (Bitbucket: ralphW, GitHub: ralphW)

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Currently there is no 'automatic' way to find users that book the items very frequently.

I suggest to create a page in the Backend to show a list of the top 50 (?) users with confirmed bookings, sorted by the number of bookings.

In the best case, those information could be accessed for different time frames and items. E.g.:

• Last month
• Last 3 months
• Last 6 months
• Last 12 months
• Since the beginning of time
• Per item
• Over all items
• Per location
• Over all locations

In addition to that, booking statistics by item and/or location could be nice.

For discussion see also http://forum.dein-lastenrad.de/index.php?p=/discussion/66/daten-zu-buchungen-pro-ausleiher

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• Bitbucket: https://bitbucket.org/wielebenwir/commons-booking/issue/126