Labels are stored on the node record itself.

o Integrated and working solution for storing node labels on the node record
  itself. If the in-record space isn't enough it will spill over to a
  dymamic array store dedicated for node labels.
o Javadocs on store migration
o Can create the node label store lazily to allow for a bridge until real migration is in place

This increments the logical log format version and will also require
migration to support migrating from the previous store format. Right now
we're left in a state where our current migration can only migrate the
next to previous store format to the current, which is a bit odd to have.