Update csv location; clean up docs.neo4j.org references.
DumpLogicalLog: Output format version.

This is crucial for debugging.
Fix broken link to Neo4j.rb.
Reintroduce automatic entity removal for legacy indexes
Update fingerprint if plan is still valid

We have three guards in place for replanning:

1. How much time has passed since the query was planned?
2. How many transactions have been committed since the query was planned?
3. How much has the statistics changed since the query was planned?

These guards are ordered the way they are since it is assumed that the
later guards are more expensive than the former guards. Going to the
store for the current transaction ID is more expensive than looking at
the current time, and going to the store for several statistical
values is more expensive than just getting a single transaction id.

This has a problem in that after a guard has first failed, it will
continue to fail even if the later guards still keep the query
alive. Say that the database is very read heavy, so after the default
query TTL of 1 second has passed, guard (1) will always say that the
query needs to be re-planned. This means that we will always go to
disk to read the transaction ID, making each execution of the query
more expensive.

This commit solves this by updating the guards that say "replan" if a
later guard says not to replan. I.e. we should update the timestamp
for a query if we find that we have not seen that many transactions.
Make sure to start the standalone page cache
Merge pull request #3579 from chrisvest/2.2-fix-standalone-pagecache

Make sure to start the standalone page cache
Introducing TripletQueryGraphCardinalityModel
Draft of VarLengthTripletCardinalityEstimator
Removed multi-threaded CC, fixed duplicated errors in multi-pass CC
Broke out property encoding into separate step
Parallelized property encoding in batch importer

by defering creation of property records until time of writing.
PropertyEncoderStep can have multiple threads encoding properties into
PropertyBlocks, attaching them to each entity.
Tagging for version 2.2.0-M01
Respect the projected direction in variable length expansions.

For patterns of the type a-[r:rel*]->(b) we should always return the the found
relationships in the order going from a to b even though the actual expansion
was done from b to a.
Additional logging of cluster state in tests, refactored LabelIT
Make sure harness and docs support libs are deployed with releases.
Include REST API docs that were already produced.
Back to development version.
Merge pull request #3582 from pontusmelke/new-card-estimates

Introducing TripletQueryGraphCardinalityModel
Merge pull request #3549 from davidegrohmann/2.2-update-fingerprints

Update fingerprint if plan is still valid