Add support for multi-statement execution

[oskarhane]

Description

Neo4j Browser will separate all statements and execute them one-by-one and break on first error and present them in a single frame with expandable view to see information about the result, but not the result itself.

Requirements

• Only Cypher queries will be executed in the multi statement context. Any client commands (those starting with :) will be ignored.
  • Possible exception is :param since they're related to cypher queries and can be seen as a natural part of a multi statement story
• Execute commands in serial and break on first error.
• It's NOT a transaction and nothing will be rolled back on error.
• Cypher warnings / hints should work as before.

Information

Changes that made this possible:

• produce error frame for unknown commands instead of red banner
• upgrade of the error frame to have all error frames look the same
• lot's of changes to cypher-codemirror which now exports a parse command

For Reviewers

Command to try (all of northwind guide):

LOAD CSV WITH HEADERS FROM "http://data.neo4j.com/northwind/products.csv" AS row
CREATE (n:Product)
SET n = row,
  n.unitPrice = toFloat(row.unitPrice),
  n.unitsInStock = toInteger(row.unitsInStock), n.unitsOnOrder = toInteger(row.unitsOnOrder),
  n.reorderLevel = toInteger(row.reorderLevel), n.discontinued = (row.discontinued <> "0");

LOAD CSV WITH HEADERS FROM "http://data.neo4j.com/northwind/categories.csv" AS row
CREATE (n:Category)
SET n = row;

LOAD CSV WITH HEADERS FROM "http://data.neo4j.com/northwind/suppliers.csv" AS row
CREATE (n:Supplier)
SET n = row;

CREATE INDEX ON :Product(productID);

CREATE INDEX ON :Category(categoryID);

CREATE INDEX ON :Supplier(supplierID);

LOAD CSV WITH HEADERS FROM "http://data.neo4j.com/northwind/customers.csv" AS row
CREATE (n:Customer)
SET n = row;

LOAD CSV WITH HEADERS FROM "http://data.neo4j.com/northwind/orders.csv" AS row
CREATE (n:Order)
SET n = row;

CREATE INDEX ON :Customer(customerID);

CREATE INDEX ON :Order(orderID);

MATCH (c:Customer),(o:Order)
WHERE c.customerID = o.customerID
CREATE (c)-[:PURCHASED]->(o);

LOAD CSV WITH HEADERS FROM "http://data.neo4j.com/northwind/order-details.csv" AS row
MATCH (p:Product), (o:Order)
WHERE p.productID = row.productID AND o.orderID = row.orderID
CREATE (o)-[details:ORDERS]->(p)
SET details = row,
  details.quantity = toInteger(row.quantity);

[oskarhane]

Don't merge, will add more tests

[oskarhane]

More tests added