More user friendly error message when trying to execute multiple statements
Merge pull request #3687 from davidegrohmann/2.0-multi-statement-error

More user friendly error message when trying to execute multiple statements
Merge 2.0-maint into 2.1-maint

Conflicts:
	community/cypher/cypher-compiler-2.1/src/main/scala/org/neo4j/cypher/internal/compiler/v2_1/parser/CypherParser.scala
Merge 2.1-maint in master

Conflicts:
	community/cypher/cypher-compiler-2.1/src/main/scala/org/neo4j/cypher/internal/compiler/v2_1/parser/CypherParser.scala
	community/cypher/cypher/src/test/scala/org/neo4j/cypher/ErrorMessagesTest.scala
Adding a new Cypher introduction and terminology.