Employee statistics | new columns Date and Valid until

Task #10324 | 5057.000

To be able to use Employee statistics even better, they need additional columns. There are two new columns:

- Date (can be used for an activation date or for ‘Assignment as of’)

- Valid until (for example, can be used for ID cards with an expiry date)

The ‘Date’ column is permanently displayed, the ‘Valid until’ column can be added and used if required via ‘Personalize -> Field’. The ‘Statistics’ infobox has also been expanded to include these two columns.