Intelmq-fody-backend

* Events: Fix `./stats?` to count events only once in case of
`intelmq-cb-mailgen` setups. Note that several entries can be returned
with the corresponding `./search?` call. See usage hint for the reason.

* Tickets:
* Change default parameters for `./stats?` to include the full last day
(based on what is the timezone of the database.)
* Cleanup code: Remove unused and broken `?id=` ability, change
`/?ticketnumber=` ability to return mailgen tables like `events/search`.

* Events:
* Change `./search?` to return the columns from `mailgen_directives` and
`mailgen_sent` tables as JSON values for easier handling in clients.
* Remove `./export?`, as too similar to `./search?` and assumed unused.
* Fix subquery for "EventID" (broken since 0.6.4).
* Fix support for hug v==2.2.0 in three endpoints.

* Events:
* Enhance endpoints `./search?`, `./export?` to allow searching by
columns from joined `directives` and `sent` tables for symmetry with the
tickets backend. Add example for searching for `recipient_group` in
`aggregate_identifier`.

* Contactdb:
* Enhance endpoint `./annotation/search?tag=` to additionally search for
email tags and return organisations with those email addresses.

Upgrade
* Optional: Add an index for "`recipient_group` to directives (2019-10)", see
https://github.com/Intevation/intelmq-mailgen/blob/master/sql/updates.txt

* Contactdb:
* Fix handling of email tags, by returning the correct default tags.

* Contactdb:
* Disallows creating CIDRs or FQDNs with the same value in a single contact;
only the first will be inserted. If this happens it shows in loglevel INFO.
* Events:
* Additional configuration parameter `database table` to set the
table name of the events table. Default is `events`.
* Contacts: Add handling of email tags.

Upgrade
* Requirements: intelmq-certbund-contact>=0.9.4 on the db server.

* Contactdb:
* Adds GET and PUT endpoints for ./email/ and an additional endpoint GET
/searchdisabledcontact to support the separate email_status table.

Upgrade
* Requirements: Check that we have postgresql v>=9.5.