Work on Cluster panel. Use of the hardware address as unique identifier.
Clustering: Add file based notification system (version files)
Cluster: Implements reload index event
Clustering:
- Visibility on other nodes
- Only requested clients are open
- The notification API call automatically use the first admin user
- When an index is updated, other nodes are notified
Merge pull request #539 from emmanuel-keller/1.6

1.6