Fix the source repository links of the components.

The scm urls in the pom files pointed to the old repositories (e.g. neo4j/community).
They now point to the correct places.
Make QueryContext partially go through kernel API

o Make hasProperty use propertyKeyId
o Make removeProperty use propertyKeyId
o Make Cypher delete entity operations go through kernel
o Introduce TokenContext has a shared trait of {Plan,Query}Context
o Enhance TokenType and KeyToken to provide getId, getOptId, getOrCreateId functionality
o Make DeleteAction take a KeyToken argument
o Support for resolving property keys at plan build time
o Make expressions.Property use KeyToken property keys
o Make Cypher setProperty operation go through the kernel
o Replace prior LabelResolution
o Make CloseableIterator always return Maps and materialize Streams
o Make Cypher getProperty go through the kernel API
o Make dumpToString() reopen QueryContext as needed
o Rewrote MapPropertySetAction
Fixes for some flaky tests

o Safeguard against NullPointerException in ConstraintVerificationFKE, by
  using evidence() method to get it.
o Fix LuceneIndexRecoveryIT.shouldNotAddTwiceDuringRecoveryIfCrashedDuringPopulation
   - Test was not deterministic about completion of population job
   - Cleaned up/reverted changes in FlippableIndexProxy made because of the above issue
Renamed the test for better epressiveness.
Added a mutating Cypher REST example. Use the Cypher prettifier everywhere.
Merge pull request #925 from systay/cykops

Make QueryContext partially go through kernel API
CreateUniqueAcceptanceTest.scala
Consistency checking for node labels.

Add test for existing label token store check.
Renamed some existing classes and test infrastructure to reduce confusion.
Check inline label ids.
Check for duplicate labels on the same node.
Check for references to not-in-use label token records.
Check dynamic label ids.
Verify that dynamic label records are inUse and cycle-free.
Encapsulate record allocation into DynamicRecordAllocator interface.
Allow tests to reproduce array store layout without needing a real store.
Restructure NodeLabelRecordLogic:
o Use polymorphism to remove repetitive conditional logic.
o Reduce coupling between field format and NodeStore
o Extract label array manipulation into LabelIdArray utility.
Run databases in target directory instead of using default temp file location.
Merge pull request #930 from apcj/2.0-label-consistency-check

Consistency checking for node labels.
Shutdown executor with timeout instead of waiting indefinitely for futures.
Run databases in target directory instead of using default temp file location.
Shutdown executor with timeout instead of waiting indefinitely for futures.
Merge pull request #865 from VolkerL/fix-scm

Fix the source repository links of the components.
Makes StatementContext stateless by splitting operations and state

StatementContext previously consisted of operations as well as state. Due
to that fact a full StatementContext instance would have to be created per
statement. Seeing that creation of these StatementContexts was very
expensive a different approach was needed.

Here the StatementContext (now renamed to StatementOperations) is
state-less and all its methods accepts a StatementState object as first
argument. The StatementState instance passed in contains all state needed
for all participating layers underneath StatementOperations.
Merge pull request #933 from tinwelint/2.0-the-cake-is-a-lie

Makes StatementContext stateless by splitting operations and state
Removed debug code left in by mistake
not cleaning up after test as file locks held on Windows, breaking CI too often
Fixed default path to be under target/

So that it gets properly ignored by git. It was changed to a non-target/ directory in ab735b2521142a2e003f1ba9668d551dd6eb7769
Fixed default path to be under target/

So that it gets properly ignored by git. It was changed to a non-target/ directory in ab735b2521142a2e003f1ba9668d551dd6eb7769