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
Fixed EZP-19161: Remove redundant indexes/keys