Add missing code for closing the pageCache when used in migration/tools
Move the adversarial file system to the io module
Add a robustness test for the page caches

It uses the adversarial file system to throw lots of exceptions at the page cache implementations.
It currently fails. Badly.
Make the MuninnPageCache survive the adversarial file system

* Fix a bug in the AdversarialFSA where mischief might prevent client code from
  ever reading the last byte of a chunk into a buffer.
* The Muninn eviction thread now no longer dies if flushing on eviction throws
  an exception.
* This makes Muninn able to recover from arbitrary errors, should their cause
  disappear.
AdversarialFSA PageCacheTest

Increase failure probabilities and fix some of the failures in the StandardPageCache.
Not all of the failures are fixed, though, so the test is still failing.
It has therefore been ignored for now, because we want to get the fixes for Muninn into master as soon as possible.
Add parens to documented cypher queries
Merge pull request #3066 from cleishm/cypher-doc-parens

[2.1] Add parens to documented cypher queries
Merge pull request #3070 from chrisvest/2.2-pc-robustness

2.2 PageCache robustness test based on the adversarial file system
Merge remote-tracking branch 'upstream/2.1-maint'

* upstream/2.1-maint:
  Add parens to documented cypher queries
Merge pull request #3052 from davidegrohmann/2.2-close-page-cache

Add missing code for closing the pageCache when used in migration/tools
Disable pretty printing ast nodes for now

We need and know how to fix excessive stack useage of perty; now's not the time for it.

If you want it back for debugging, just un-commment in ASTNode.
Speculative fix for Windows
Replace uses of Map.mapValues (which is lazy) with Eagerly.(mutable|immutable)mapValues

o Deprecate Materialized from commons (see comment there)
Merge pull request #3082 from boggle/eager-map-vals

Replace uses of Map.mapValues (which is lazy) with Eagerly.(mutable|immu...
Merge pull request #3080 from boggle/disable-perty

Disable pretty printing ast nodes for now
Initial identifer namespacing work
Make namespaceIdentifiers less invasive

The rewriter will only introduce special names for identifiers if
there's shadowing involved. Specifically, if an identifier is never
projected through from one scope to another, it will not be altered.
In addition, trivial projections such as `WITH n AS n` are also
understood not to introduce ambiguity to identifiers.
Specify the right local effects on the optional match pipe
Simplify inliningContext given our new contracts for shadowing

This also allows for more aggresive inlining. See StatementConvertersTest
for examples of AST -> PlannerQuery conversions that are now more inlining
happy.
Improve the clustering of identifiers to address scoping limitations