New functionality: Add new split classes.

New folder under records: new_splits
New config for validation under new_slits

Table columns:  AD DBD synonyms xrefs

Function for adding splits is here:

https://github.com/VirtualFlyBrain/VFB_neo4j/blob/master/src/uk/ac/ebi/vfb/neo4j/flybase2neo/feature_tools.py#L370


