EHN: Add new base schema (db_5_0.sql) for installation

procedures/query/getDoubleWhereClause.sql

procedures/query/initBackReference.sql

procedures/query/initDisjunctionFilter.sql

procedures/query/initEntity.sql

procedures/query/initPOV.sql

procedures/query/initQuery.sql

procedures/query/initSubEntity.sql

procedures/query/initSubProperty.sql

procedures/query/intersectTable.sql

procedures/query/makeStmt.sql

procedures/query/raiseWarning.sql

procedures/query/unit_functions.sql

procedures/registerSubdomain.sql

procedures/retrieveDatatype.sql

procedures/retrieveEntity.sql

procedures/retrieveEntityOverrides.sql

procedures/retrieveEntityParents.sql

procedures/retrieveEntityProperties.sql

procedures/retrieveGroup.sql

procedures/retrieveSubentity.sql