Test case and proposed fix for ensuring received transctions are in the logical log before being applied to the store files

Properly fixed the same xid start entry issue (without sacrificing data integrity) and added a comment explaining the problem
Backported from 86e9e965fb5043456ff2d1645cf9008ca1b844ff
Conflicts:

	kernel/src/main/java/org/neo4j/kernel/impl/transaction/xaframework/XaLogicalLog.java

Fix for an NPE when loading property indexes from a write transaction from a db with many property keys in
(cherry picked from commit 6c68102c0389f2116a69fdb222882bf556d661c3)

When checking if a node has relationships, if it is a optional node that is null, return false.

Conflicts:

        cypher/src/main/scala/org/neo4j/cypher/commands/Predicate.scala
        cypher/src/test/scala/org/neo4j/cypher/ExecutionEngineTest.scala

Organized imports.

Conflicts:

	kernel/src/main/java/org/neo4j/kernel/impl/transaction/SpringTransactionManager.java
	kernel/src/main/java/org/neo4j/kernel/impl/transaction/UserTransactionImpl.java

SpringTransactionManager and UserTransactionImpl stored a reference to the TransactionManager which was no longer
valid after a master-switch, now the tx-manager is looked up in the GraphDatabaseAPI for all operations.

NOTE: The API of UserTransactionImpl changed, it takes a GraphDatabaseAPI constructor parameter again (was changed in 1.7
to javax.transaction.TransactionManager).

Conflicts:

	kernel/src/main/java/org/neo4j/kernel/impl/transaction/SpringTransactionManager.java
	kernel/src/main/java/org/neo4j/kernel/impl/transaction/UserTransactionImpl.java

(cherry picked from commit e75d33e4bba05b2697f9b7c4778dd55f84b09f9f)

Conflicts:

	kernel/src/main/java/org/neo4j/unsafe/batchinsert/BatchInserterImpl.java
	kernel/src/test/java/org/neo4j/unsafe/batchinsert/TestBatchInsert.java

Optimization for reducing number of array copies needed when creating relationships and updating the cache

Fix of #256 for 1.6

Fixed bug that showed up when using aggregation and skip/limit - 1.6

(cherry picked from commit 62d36d01021072e06fbb04529fb0bac2e43c00ca)

Conflicts:

	kernel/src/main/java/org/neo4j/kernel/impl/util/FileUtils.java
	kernel/src/test/java/org/neo4j/kernel/impl/AbstractNeo4jTestCase.java

(cherry picked from commit ea063ca1afecc64b0506c32e1a6ac8dd5ae19b27)

Conflicts:

	kernel/src/main/java/org/neo4j/kernel/DefaultFileSystemAbstraction.java
	kernel/src/test/java/org/neo4j/test/impl/EphemeralFileSystemAbstraction.java

Moved GC resistent cache to enterprise and made cache implementations pluggable via Service loader

Fixes an issue where id generators with aggressive reuse enabled couldn't read id batches that were written out during the same session

Conflicts:

	kernel/src/main/java/org/neo4j/kernel/impl/nioneo/store/IdGeneratorImpl.java
	kernel/src/test/java/org/neo4j/kernel/impl/nioneo/store/TestIdGenerator.java

Can reuse cache instances in between sessions, by overriding the behaviour of AbstractGraphDatabase#createCaches()

Fixed an issue where a 'get' on a lucene index wouldn't honor if the queried value was a numeric value (via ValueContext#numeric)