v1.3 New python driver

[StanislasGuinel]

This PR uses the new Neo4j python driver to export nodes/relationships by batch without exporting a csv to the Neo4j server import directory.

• [x] Batch write transactions to create nodes and relationships
• [x] Parameter to choose the export methods: LOAD CSV vs write_transactions
• [x] Always have an export folder (even empty) in whatever connection
• [x] Count/weight incremental properties when nodes/relationships are updated becomes a parameter