* Remove last of $wgDBuser-specific settings like timezone, datestyle and search_path. This is all handled by open() :D
* Only set search_path if the schema exists (rather than just set to some random string), fall back to 'public' otherwise
* Only call setupUser() if we need to _CreateDBAccount, otherwise it returns immediately and confuses you (no functional change)
* Implement selectDB() for Postgres, basically call open() with a new DB name
* Try to fix setupDatabase() for this "user must be owner of relation" error I'm getting when the $wgDBuser exists (have tried with roles granted && no roles granted). I get no errors at all when
* Set up and use function for renaming tables
* Use $conn instead of $this when it is called for
* remove protection from commitChanges so the installer can use it
* Made them all implement one common interface (might add more functions to it later)
* Moved MySQLField to DatabaseMysql.php
* Renamed nullable() to isNullable()
* Removed maxLength() from:
** SQLiteField: makes no sense
** MySQLField: doesn't do what people may think, useless for this class' purpose of assisting querying the DB schema
* Still not doing sequential updates, but now this should be easier to correct
* Corrected addition of page_restrictions.pr_id field to use the correct sequence name
* Had to change DatabaseUpdater::getOldGlobalUpdates() from private to protected, since PostgreSQL has its own globals for extensions
* Moved do_all_updates() and archive() to the top of updaters.inc so that they are easier to find
