Feature: auto-explain mode

[cheerfulstoic]

This would be a setting that you could set which would automatically prepend EXPLAIN (perhaps PROFILE EXPLAIN) to the beginning of each query. In the cypher output the query plan could be shown. What I care about more, though, is outputting the warnings from 3.2.0 so that people using Neo4j.rb can easily switch to a mode to see where their queries aren't ideal. Unfortunately these warnings only come back if you use EXPLAIN