o_sort has to allow null, can't be in primary key

Update primary key creation.

These were previously modified live.

The page in the [SMW documentation](https://github.com/SemanticMediaWiki/SemanticMediaWiki/blob/master/docs/examples/hook.sqlstore.installer.beforecreatetablescomplete.md) should be updated for smw_di_wikipage.

set permissive temporarily when converting table

IDatabase update

Add hooks for SMW index modifications that are needed

(Also restore PerconaInstaller shim.)

stability