Allow instances to restart at election version 0. This will happen if an instance crashes and rejoins.

Conflicts:
	enterprise/cluster/src/main/java/org/neo4j/cluster/protocol/atomicbroadcast/multipaxos/context/ClusterContextImpl.java
Fixed list parsing on empty string
On bind, update the ClusterConfiguration as well
Ensure UniquenessConstraint created by BatchInserter are consistent.

A UniquenessConstraint consists of two records in the Schema store, one
representing the constraint, and one representing the backing index. The
backing index should reference the constraint as its owning constraint,
and the constraint should reference that it owns the index. The
BatchInserter failed to set up this relationship properly since it
generated the id for the constraint record twice.
This commit fixes that issue.
Typo in installation instructions.
Fix so that read-only transactions actually do have transaction state
Merge pull request #2606 from rickardoberg/readonlytxfix

Fix so that read-only transactions actually do have transaction state
Merge pull request #2603 from thobe/2.0-consistent-batch-constraints

[2.0] Ensure UniquenessConstraint created by BatchInserter are consistent.
Merge branch '2.0-maint' into 1.9-merge

Conflicts:
	enterprise/cluster/src/main/java/org/neo4j/cluster/protocol/atomicbroadcast/multipaxos/context/ClusterContextImpl.java