Each EQ search extended with existance

As agreed

+

Found bug in tests, previous tests were just running over dictionaries (not over DB).
Now fixed, [TestCase inheritance was missing](https://github.com/igorkramaric/daffodil/commit/045b811094d0cb1b9cdd0ac91ace892f033c13dd#diff-3eb4d995269f8dd7de58cb236d151d7bR393).

Probably travis was not running this one either.