Intelmq-fody-backend

* Fixed compatibility of contactdb_api with PostsgreSQL >= 10.0.

* Added authorization and session handling.
* Added script to add users to the database.

* Tickets and Events:
* Send the timezone of the database via the /subqueries endpoint
to allow the front end to display how values are interpreted in queries.

Upgrade

* Check that `SHOW timezone;` in the database gives a full timezone name,
otherwise set it explicitly (find more details in `setup()` of
`events_apt/events_api/serve.py).

* Tickets and Events:
* Indicate a client problem, if stats? endpoints are called with their main
range selection parameters given more than once.
* Small text improvement delete `Tag` from `Recipient Group Tag` subqueries.
* config/apache-example:
Add LogFormat to log time taken to serve the request to the LogFormat.

* Tickets and Events:
* Improve frontend usability by automatically searching for substrings
in case of `_icontains` subqueries and by searching case-insensitive
for strings in general.
* Remove `_encl` subqueries as they are not needed.
* Make subqueries similar (and equal in case of `intelmq-cb-mailgen`
setups) between Tickets and Events.
* Events: Add default subqueries for recipient email addresses.

* Events: Fix endpoints that use queries with mailgen tables to also
include events that have not been sent yet.