Add simple history for changes made in admin tool

[remyguillaume]

Who requested this new feature?

Basel-Stadt

Is your feature request related to a problem?

No

Describe the solution you'd like

We would like to have better database tracking of who last modified what.
Concretely, we would need for each row in every table in the main schema (except perhaps tsearch) the following information:

• create_user: user who created this entry
• create_date: creation timestamp
• modify_user: last user to modify this entry
• modify_date: last modification timestamp

These fields would be filled in automatically when making a change in the administration interface, and visible in the administration interface.

Additional information or points to watch out for