automatic substructure dense nodes

[jexp]

Add procedures to automatically create and update multi-level trees for multi-million relationship-dense nodes to reduce read and write contention.

Procedures

• apoc.dense.create.relationship(n1,type,props,n2)
• apoc.dense.delete.relationship(n1,type,props,n2)

Function/Procedure

• apoc.dense.relationships(n1,type[,props],level/count)

create a tree with levels that will be filled with (1k,10k relationships per tree-node (and another 100-1k relationships to the next level of tree-nodes) and if it is full, a new level is added, where the next n relationships will be sent to).