This commit is the result of the squash of the following main commits:

Author: Eric Bollengier <eric@baculasystems.com>
Date:   Tue Jul 21 10:28:13 2020 +0200

    regress: Add copyright to regress scripts

Author: Eric Bollengier <eric@baculasystems.com>
Date:   Fri Jun 12 18:03:24 2020 +0200

    regress: Add more tests to events-filter-test with custom events

Author: Eric Bollengier <eric@baculasystems.com>
Date:   Wed Apr 22 18:36:01 2020 +0200

    regress: Add events tests