- Stop using NEO source code as sample data.
- For ZODB5, add a test that does not merge several DB.

Replication is also fully reimplemented:
- It is not done anymore on whole partitions.
- It runs at lowest priority not to degrades performance for client nodes.

Schema of MySQL table is changed to optimize storage layout: rows are now
grouped by age, for good partial replication performance.
This certainly also speeds up simple loads/stores.

Storage.importFrom is changed for resumable imports.

git-svn-id: https://svn.erp5.org/repos/neo/trunk@2778 71dcc9de-d417-0410-9af5-da40c76e7ee4