Stage 1 & 2 rework

[legraphista]

Stage 2 is still very slow and it keeps both node's process and neo4j's processes bellow 50%.
A wild guess is that because seeking a :Claim before creating the :Claim is locking and it needs to be handled single threaded. Since Stage 2 creates relationships and also adds :Claim properties, this means that the node creation is also slowed down.

So a way to work this around and possibly fix the slow import on stage 2 is to create the :Claim nodes beforehand, in stage 1 and leave stage 2 only for relationships. Maybe even store more id's before flushing it out. So the only thing that needs storing is the :Entity id and the :Claim id in a hash table where the key is the relation type.