add db validation for (Embedded API, Embedded Cypher, JDBC Cypher Remote) using validation parameters created using Embedded Cypher
fix bug found during db validation, notably Query5, Query9, and Query10 reported duplicate results when friends were also friends of friends
updated description of Query5 after validation exposed the fact that Forum.title is not a unique property
update tests to cover all the scenarios that were exposed by validation (caused it to fail), which had not been covered by previous correctness tests (they had all passed)
update ldbc_driver