Nicer error messages on transaction failure, especially when trying to delete a node that has relationships

Fix better error message when failing opening resource in load csv

Conflicts:
	community/kernel/src/main/java/org/neo4j/kernel/InternalAbstractGraphDatabase.java

Move CSV handling to QueryContext

Conflicts:
	community/cypher/cypher-commons/src/main/scala/org/neo4j/cypher/CypherException.scala
	community/cypher/cypher-compiler-2.1/src/main/scala/org/neo4j/cypher/internal/compiler/v2_1/ClosingIterator.scala
	community/cypher/cypher-compiler-2.1/src/main/scala/org/neo4j/cypher/internal/compiler/v2_1/ast/Query.scala
	community/cypher/cypher-compiler-2.1/src/main/scala/org/neo4j/cypher/internal/compiler/v2_1/ast/convert/StatementConverters.scala
	community/cypher/cypher-compiler-2.1/src/main/scala/org/neo4j/cypher/internal/compiler/v2_1/parser/CypherParser.scala
	community/cypher/cypher-compiler-2.1/src/main/scala/org/neo4j/cypher/internal/compiler/v2_1/parser/Query.scala
	community/cypher/cypher-compiler-2.1/src/main/scala/org/neo4j/cypher/internal/compiler/v2_1/pipes/LoadCSVPipe.scala
	community/cypher/cypher-compiler-2.1/src/main/scala/org/neo4j/cypher/internal/compiler/v2_1/pipes/QueryState.scala
	community/cypher/cypher-compiler-2.1/src/main/scala/org/neo4j/cypher/internal/compiler/v2_1/spi/DelegatingQueryContext.scala
	community/cypher/cypher-compiler-2.1/src/main/scala/org/neo4j/cypher/internal/compiler/v2_1/spi/QueryContext.scala
	community/cypher/cypher-compiler-2.1/src/test/scala/org/neo4j/cypher/internal/compiler/v2_1/ClosingIteratorTest.scala
	community/cypher/cypher-compiler-2.1/src/test/scala/org/neo4j/cypher/internal/compiler/v2_1/pipes/LoadCSVPipeTest.scala
	community/cypher/cypher/src/main/scala/org/neo4j/cypher/internal/CypherCompiler.scala
	community/cypher/cypher/src/main/scala/org/neo4j/cypher/internal/spi/v2_0/TransactionBoundQueryContext.scala
	community/cypher/cypher/src/test/scala/org/neo4j/cypher/ExecutionEngineTest.scala
	community/cypher/cypher/src/test/scala/org/neo4j/cypher/internal/compiler/v2_1/ExecutionPlanBuilderTest.scala
	community/cypher/cypher/src/test/scala/org/neo4j/cypher/internal/compiler/v2_1/LabelActionTest.scala
	community/cypher/cypher/src/test/scala/org/neo4j/cypher/internal/compiler/v2_1/QueryStateHelper.scala
	community/cypher/cypher/src/test/scala/org/neo4j/cypher/internal/spi/v2_0/TransactionBoundExecutionContextTest.scala
	community/cypher/cypher/src/test/scala/org/neo4j/cypher/internal/spi/v2_0/TransactionBoundQueryContextTest.scala
	community/cypher/cypher/src/test/scala/org/neo4j/cypher/internal/spi/v2_1/TransactionBoundExecutionContextTest.scala
	community/kernel/src/main/java/org/neo4j/kernel/impl/nioneo/xa/NeoStoreTransaction.java
	community/kernel/src/main/java/org/neo4j/kernel/impl/transaction/xaframework/XaResourceManager.java
	community/server/src/test/java/org/neo4j/server/rest/transactional/CypherExceptionMappingTest.java

Widens recoverable failure scenarios for schema indexes

Remove the CleanupService

Fixes for PERIODIC COMMIT

We want to consolidate access to the outside world
behind this facade. That makes it possible to handle
freeing of resources in QueryContext's, instead of
having multiple places remember to clean up state
after a query is finished.

This is safe to do since we in 2.0 also require transactions for reads.
That way, we never litter outside of transactions, and so any trash that might have escaped,
is now being cleaned up along with the transaction state.

2.1 PERIODIC COMMIT docs

release already released Cypher compilers, take two

2.1 cypher documentation test cleanup

Failures while populating indexes include crashes which may leave the
 index files themselves inconsistent. That may lead to the indexes
 being unable to open and recovery on them impossible to proceed. However,
 such a scenario can be recovered by deleting and repopulating the index,
 as it's done for failures so far.
 This commit adds two more exceptions to the list of recovereable errors.
 FileNotFoundException and EOFException thrown when opening a lucene
 index, which may come up if the index is not closed properly, as in
 the case of a VM crash.

Introduce per-version QueryCache

Merges 2.0-maint into master

Merge branch 1.9-maint into 2.0-maint

Break down ExecutionEngineTest into smaller pieces

Queries don't have to run in transactions that are later rolled back

o This avoids allocating pairs of (version, query)
o This avoids allocating lambdas in prepare for compiler-2.1