Merge pull request #80 from VirtualFlyBrain/Defaulting2V4

Defaulting to Neo4j V4 and falling back to v3.

src/vfb_connect/neo/neo4j_tools.py

@@ -89,12 +89,12 @@ def __init__(self, endpoint = get_default_servers()['neo_endpoint'],
         self.base_uri = endpoint
         self.usr = usr
         self.pwd = pwd
-        self.commit = "/db/data/transaction/commit"
-        self.headers = {}
+        self.commit = "/db/neo4j/tx/commit"
+        self.headers = {'Content-type': 'application/json'}
         if not self.test_connection():
-            print("Connecting to Neo4j v4+")
-            self.commit = "/db/neo4j/tx/commit"
-            self.headers = {'Content-type': 'application/json'}
+            print("Falling back to Neo4j v3 connection")
+            self.commit = "/db/data/transaction/commit"
+            self.headers = {}
             self.test_connection()
 
     def commit_list(self, statements, return_graphs=False):