[MOTOR-84] Drop support for indexing Motor cursors with "[n]" - MongoDB Jira

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Breaking change. Implementing this API for Motor was a mistake:

@gen.coroutine

def fifth_item():

    yield collection.insert([{'i': i} for i in range(10)])

    cursor = collection.find().sort([('i', 1)])[5]

    yield cursor.fetch_next

    doc = cursor.next_object()

Require users to set skip and limit longhand:

@gen.coroutine

def fifth_item():

    yield collection.insert([{'i': i} for i in range(10)])

    cursor = collection.find().sort([('i', 1)]).skip(5).limit(1)

    yield cursor.fetch_next

    doc = cursor.next_object()

    print(doc['i'])

IOLoop.current().run_sync(fifth_item)

is depended on by

MOTOR-64 Incorrect iteration of MotorCursor causes infinite loop