245 performance optimization

[philboeselager]

This is a big one.

• The evaluation containers redRecords, yellowRecords and greenRecords have moved into the Enrichment class.
• Records are stored to disk. Beforehand, they have been kept in memory. The DataContainer therefore only keeps the record's IDs now.
• Records are consequently stored to and loaded from disk, after each step of the enrichment process. This helps reducing the overall memory usage.
• cleanup of stale code
• small optimizations, like a further readable date format.