NXP-14750: implement new nx_children using CTE for PostgreSQL, adding test suite to test path search without pathOptim
NXP-14750: move nx_children procedure afterTableCreation
NXP-14750: Implement new nx_children using CTE for SQLServer mssql
NXP-14774: replace SQLRepositoryTestCase with CoreFeature
NXP-14733: fix for mysql, something is in the built-in stopword of mysql