Change visitor return value behaviour, so that it is consistent in all uses (false means continue)
Introduce checksum on ephemeral filesystem, primarily to be able to compare snapshots.

Formatting according to new template.
Added support for reading CSV header from separate file

and support for having multiple files look like one CharSeeker. There's
also a clearer separation of concerns between, Readable and CharSeeker and
where they are instantiated.
Make sure not to produce non-argument leaf plans for arguments
Merge pull request #3361 from tinwelint/2.2-bip-csv-header-in-separate-file

Added support for reading CSV header from separate file
Fix for the cardinality estimation in presence of arguments.
Fixed bug in encoding short strings
Merge pull request #3357 from rickardoberg/visitorfix

Change visitor return value behaviour
Allow startup monitoring and added SwitchToSlave monitor.

Will be used during HA robustness testing.
Order the locking of nodes when creating a relationship.
Merge pull request #3369 from jakewins/2.1-rellockorder

Order the locking of nodes when creating a relationship.
Merge branch '2.1-maint'
Merge pull request #3366 from martinfurmanski/ha-add-startup-monitors

Allow startup monitoring and added SwitchToSlave monitor.
Merge pull request #3360 from pontusmelke/cardinality-fix

Fix for the cardinality estimation in presence of arguments
Expose a way to ask a lucene index to sample index selectivity

o Scan a sample of index entries and compute uniqueSampledValues / sampleSize
Add a new CountsKey for index entry counts
Maintain index update counts from index proxies

o OnlineIndexProxy will ensure that the index counts are updated
o Fix bug when generate LazyIndexUpdates to never construct 'overlapping updates'
o Cleanup code in LazyIndexUpdates
o Make sure we update index update counts during population
Add minor version to CountsStore such that we can flush safely on index flip (outside of log rotation)

o Ensure we compare CountsKeys correctly by type
o Fix reading of index keys
o Add flushIndexCounts() to IndexStoreView
Remove index counts when dropping an index
Make index stats part of SchemaRead and add indexNumberOfEntries

Rationale: For planning to be sane, indices shouldn't appear or disappear out of nowhere, hence we need to be tied to the schema read lock
Add IndexStatisticsTest