Introduce an Exists predicate to be used in the absence of meaningful predicates on a node
Make predicate combination easy to change, and change it to assume dependence
Make Muninn support Java8
Merge pull request #3113 from systay/exists-predicate

[2.2] Another tweak of the cardinality model
Merge pull request #3117 from chrisvest/2.2-make-pagecache-support-java8

2.2 Make Muninn support Java8
first draft new cypher introduction
minor fixes to cypher intro
Merging updates from MH, with some fixes applied.
cypher-intro almost done
Wrapping up merge.
cypher intro: load csv, programmatic use, additional data
Some tweaks to the load csv and programmatic use parts.
Creating an initial structure.
Split into multiple pages.
Include in the manual.
Chapter on Cypher vs SQL.
Adds support for noexec and parameters to GraphGist.
Work on loading data.
Finished UI part of noexec for Cypher; config cleanup.
Fix refcard tests.