Changes to mdl_user:

* Change timezone to varchar(100) (to support non-trivial timezones)
* Drop timezonename (will not be used after all)

lib/db/postgres7.sql

@@ -374,8 +374,7 @@ CREATE TABLE prefix_user (
    country char(2) default NULL,
    lang varchar(10) NOT NULL default '',
    theme varchar(50) NOT NULL default '',
-   timezone float NOT NULL default '99',
-   timezonename varchar(100) NOT NULL default '',
+   timezone varchar(100) NOT NULL default '99',
    firstaccess integer NOT NULL default '0',
    lastaccess integer NOT NULL default '0',
    lastlogin integer NOT NULL default '0',