Пакет alterator-datetime: Информация

- Check that supported ntp service is installed (closes: #38168).
- datetime-functions: Add numeric TZ to list_zone() output
  (closes: #20505).
- datetime-functions: Declare variable.

- datetime-functions: Unquote timezone string (closes: #35355).
- test: Update check-timezone.sh for zone1970.tab file.
- datetime-functions: Use zone1970.tab file (closes: #37741).

- Run tests when building.
- Fix/improve: Protect the installer UI from runtime errors on
  country change.
- Added unit-test to check the "timezone" type.
- Fixed (type timezone): allow [_-] symbols and more than one "/".