Provide demo data

assigned to @nik

Please split the script out into its own commit. Also, please add another commit, updating the changelog.

I'd also rather name this command something else that makes it clear it is not a command intended for production.

added 3 commits

• 923d2157 - Add management command for moving all Chronos dates to current year
• 2c696274 - Provide demo data as Untis dump
• 29a7f98d - Update changelog

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resolved all threads

merged

mentioned in commit ec88618c