Added: cleanup queries for ezcontentobject_link table
Removed: ezcontentobject_link.op_code column
Changed: welcome 2013
Merge pull request #13 from pspanja/EZP-20239

Cleanup queries for ezcontentobject_link table
Fixed #20824: ezoracledb->generateSQLINStatement - not working correctly for items > 1000
Merge pull request #14 from jjCavalleri/20824

Fixed #20824: ezoracledb->generateSQLINStatement - not working correctly for items > 1000
EZP-21412: Improved insert/update of cache

Implements _insertUpdate in the Oracle DFS handler in order
to better handle race conditions.
- only updates entries that weren't changed (mtime) since
  we checked for their existence (better performances)
- silently (jerken-clustering notice) ignores insert failures
  on duplicate key
- doesn't store nor end generation when no cache has been written
  to DFS (better performances)
EZP-20048: removed instructions about DB cluster
EZP-21648: added priority and is_hidden columns to eznode_assignment table
Merge pull request #16 from pspanja/fix-EZP-21648-node_assignment-new-columns

Fix EZP-21648: when publishing Content with Location some Location create struct properties are not respected