Throttles debug logging for one of two problematic debug log statements.
Puts lock releasing in finally blocks
Throttles cluster transition logging.
Merge pull request #2053 from jakewins/1.9-transitionthrottle

Throttles cluster transition logging.
Fix a bug where store migration forgets about legacy indexes.

IndexManager now also respects the availability guard (by virtue of transaction begin) when creating an index.
Replaces full backup and HA copy store with a common implementation.

 o Solves an issue where COPY_STORE and FULL_BACKUP implemented their own
   mechanism for recovery, rather than allowing data sources to run regular
   recovery. This caused problems as the two mechanisms risk diverging.
 o Adds a LogWriter API to allow external tools to write arbitraty logs for
   arbitrary data sources.
 o Refactors a workaround in backup to ensure log files exist into its own
   class.
Only migrate legacy index.db store files if they exist.
Merge pull request #2052 from jakewins/2.0-logthrottle

Throttles debug logging for one of two problematic debug log statements.
Merge pull request #2068 from tinwelint/2.0-release-locks-fin

Puts lock releasing in finally blocks
Merge pull request #2088 from chrisvest/legacy-index-migration

Fix a bug where store migration forgets about legacy indexes.
Returns a copy of the suspicions set

out from the HeartbeatContext so that putting that set in a message that
gets processed and serialized later on won't risk concurrent modification
issues with other incoming message handling modifying that set.
Merge pull request #2039 from jakewins/2.0-better-backup

Replaces full backup and HA copy store with a common implementation.
More consistency checking for relationship group records

Added the following checks:
o RelationshipGroupRecord has invalid rel type id
o RelationshipGroupRecord has invalid next pointer
o RelationshipGroupRecord chain is unsorted
o RelationshipGroupRecord refers to relationship that is not in use
o RelationshipGroupRecord refers to relationship that is not first in its
  chain
o RelationshipGroupRecord refers to relationship that is of a different
  relationship type than its group
Now closes the file channel after the test
Renamed LogWriter to LogBufferFactory, added Javadoc
Clarify the error message for when releasing locks claim prior to a master-switch.

Also dramatically reduce the output in the log, when the failed transaction is big and has taken thousands of locks, for instance.
Fixed test breaking on winblows.
Introduce Selections to the QueryGraph and SQGBuilder

o SQGB: For now only works with HasLabels() in MATCH
o Renamed ProjectionPipe to ProjectionNewPipe
o QueryGraph: Projections are now a Map[String, Expression]
Prototype simple label scan support for new planner
Merge pull request #2094 from chrisvest/2.0-explain-master-switch-lock-failures-better

Clarify the error message for when releasing locks claim prior to a master-switch.