Bug 7440 - Remove NoZebra vestiges

Bug 7440 - Remove NoZebra vestiges

Removed NoZebra vestiges. This comprises several code blocks that depend on the NoZebra syspref and NZ related functions/methods.

C4::Biblio->
 GetNoZebraIndexes
 _DelBiblioNoZebra
 _AddBiblioNoZebra

C4::Search->
 NZgetRecords
 NZanalyse
 NZoperatorAND
 NZoperatorOR
 NZoperatorNOT
 NZorder

C4::Installer->
 set_indexing_engine

Sponsored-by: Universidad Nacional de Córdoba
Signed-off-by: Julian Maurice <julian.maurice@biblibre.com>
Signed-off-by: Paul Poulain <paul.poulain@biblibre.com>
Signed-off-by: Jared Camins-Esakov <jcamins@cpbibliography.com>