Bug 24735: Remove QueryParser-related code

Bug 24735: Remove QueryParser-related code

At the last development meeting we have voted to remove the
QueryParser-related code
https://wiki.koha-community.org/wiki/Development_IRC_meeting_19_February_2020

Hea tells us that it has not been adopted, and the code/bug tracker that
it is not really usable as it. As nobody is willing to work on it, we
decided to remove it instead.

Test plan:
 % prove t/db_dependent/Search.t
must return green

See commits from bug 9239 and confirm that the code is removed in this
patch.

Also play with the search on the UI and confirm that you do not see
obvious regressions

Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>
Signed-off-by: Katrin Fischer <katrin.fischer.83@web.de>
Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>