Implement ℓ-diversity

[LiFaytheGoblin]

ℓ-diversity is an advanced anonymization algorithm. In order to anonymize data more reliably while also loosing less potentially valuable information, implement ℓ-diversity. Other anonymization algorithms could also be taken into consideration.

• write a PHP library that can anonymize arrays of objects with l-diversity (that's the form that returned database records have)
• use the PHP library to anonymize the queried records before storing
  • for dataset
  • for related_data
• check that relations between tables are kept, while also avoiding them to give away identity