support having PHP-only upgrade operations (no .sql file) using an upgrade_foo function
support having PHP-only upgrade operations (no .sql file) using an upgrade_foo function


git-svn-id: a7fabbc6a7c54ea5c67cbd16bd322330fd10cc35@21720 b456876b-0849-0410-b77d-98878d47e9d5

changi67/tiki,oregional/tiki,changi67/tiki,changi67/tiki,oregional/tiki,changi67/tiki,tikiorg/tiki,oregional/tiki,changi67/tiki,oregional/tiki,tikiorg/tiki,tikiorg/tiki,tikiorg/tiki