Fix versioning UDC integration test module.
Fix the semantic check for USING INDEX hint to inspect node patterns

- Also, fix the way it was handling predicates in WHERE.
Fix handling of dependencies introduced by UNWIND
Merge pull request #2433 from jakub-/using-index-hint-fix

Using index hint fix
Add UDC stats for memory and processors.
Merge pull request #2413 from benbc/2.1-udc-integration-test-fixes

2.1 udc integration test fixes
Merge pull request #2435 from benbc/2.1-more-udc-stats

Add UDC stats for memory and processors.
Cypher vs SQL chapter.