fixed free disk space percentage
added support for referencing distinct return expressions in order by
Fixes #578
Adds docs for ha.slave_only.
added detection for full vs incremental backup/ deprecated -full and -incremental flags from backup tool
Merge pull request #627 from lassewesth/tweakstobackup

added detection for full vs incremental backup and deprecated mode flags
Put an entry to control concurrency into the docs.
Merge pull request #626 from jexp/diagnostics-free-disk-space-percentage

fixed free disk space percentage reporting
Handles single node patterns in MATCH
Merge pull request #637 from systay/single-node-patterns

Handles single node patterns in MATCH
Merge remote-tracking branch 'upstream/master' into 2.0

Conflicts:
	community/cypher/src/main/scala/org/neo4j/cypher/internal/executionplan/ExecutionPlanImpl.scala
	community/cypher/src/test/java/org/neo4j/cypher/javacompat/JavaQuery.java
	community/cypher/src/test/scala/org/neo4j/cypher/ExecutionEngineTest.scala
	community/cypher/src/test/scala/org/neo4j/cypher/docgen/DocumentingTestBase.scala
Merge remote-tracking branch 'upstream/master' into 2.0

Conflicts:
	community/cypher/src/main/scala/org/neo4j/cypher/internal/commands/NamedPath.scala
	community/cypher/src/main/scala/org/neo4j/cypher/internal/parser/v1_9/Expressions.scala
	community/cypher/src/main/scala/org/neo4j/cypher/internal/parser/v1_9/MatchClause.scala
	community/cypher/src/test/scala/org/neo4j/cypher/CypherParserTest.scala
	community/cypher/src/test/scala/org/neo4j/cypher/SyntaxExceptionTest.scala
Merge pull request #641 from boggle/2.0

merges master
Update store version record in NeoStore when migrating to new store format.
Ensure that dynamic properties are loaded before creating NodePropertyUpdates.
Cypher checks if indexes are online before using them
Add ignored test that illustrates problems in PropertyPhysicalToLogicalConverter.
Only make records heavy once; don't try to load data from store if it hasn't been written yet.

- renamed makeHeavy() methods to ensureHeavy()
- moved checking of isLight() inside the ensureHeavy() methods and removed it from call-sites.
Remove usage of deprecated method for determining index state.
Removed debug code