Fix: merge must fail when trying to create 2 nodes with same id but different labels (e.g., MERGE (a: Foo)-[r:KNOWS]->(a: Bar))
Merge pull request #2317 from davidegrohmann/2.0-maint

Fix: merge must fail when trying to create 2 nodes with same id but different labels
Tagging for version 2.1.0-M02
Back to development version.
Fixes race that can cause duplicate writes in XaLogicalLog

There is a possible window where a transaction may fail to flush
 the log buffer (for example, during a commit) and even though
 it will set the KernelHealth to notOk, another thread can still
 come and try to flush the same contents again (say, by attempting
 a commit of its own tx). This can cause the log to be unrecoverable.
 This commit fixes this issue by introducing checks to KernelHealth
 before any write happens to the log's underlying file.
Store resolved ids for label, property names, and rel types in semantic table rather than ast
Sort files to make it easier to find the correct files in the log. Specifically, it should be easy to see what logical logs are available, and what sizes they have. Without this it's pretty darn hard.
Merge pull request #2326 from digitalstain/1.9-fix-damaged-log-writes

Fixes race that can cause duplicate writes in XaLogicalLog
added script to detect unauthorized contributors
Make Cypher reject using the same relationship identifier for multiple pattern
added script to detect unauthorized contributors
added script to detect unauthorized contributors
Use latest version of scala-maven-plugin
testing anonymous contributions: adding a dot
Merge pull request #2322 from davidegrohmann/ids-semantic-table

Store resolved ids for label, property names, and rel types in semantic table rather than ast
Merge pull request #2300 from boggle/no-double-patterns

Make Cypher reject using the same relationship identifier for multiple p...
testing anonymous commits: changed a comment
testing anonymous commits: removed a newline in text
Merge pull request #2330 from lassewesth/anoncontrib

Testing anonymous contributions
fix for TopPipe with duplicate values