WIP: Add backend and view for PIN authentication

added 6 commits

• a035eee8 - Add method for creating a PIN-based login automatically
• a6bc73b4 - Use dev branch of RWA version of AlekSIS
• 569c13ad - Reformat
• 81512ac0 - Delete PIN-based users after logout to prevent abuse
• beb8b191 - Fix bug in random PIN generation
• 09443afd - Adapt new ALTERNATIVE_LOGIN_VIEWS structure

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added 1 commit

• 4831b86f - Improve PIN backend

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added 1 commit

• 6eb58571 - Fix start number generation for random PIN generation

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merged