Going ahead with the switch to tabs. This is a major coding standards change! If any unusual parser bugs show up, check this changeset. Converted all .php, .js, .tpl, .css, and .json files and did basic testing.
ALTER TABLE {{TABLE_PREFIX}}session_keys ADD COLUMN key_type smallint NOT NULL DEFAULT 0;
UPDATE {{TABLE_PREFIX}}session_keys SET key_type = 2 WHERE auth_level > 2;
ALTER TABLE {{TABLE_PREFIX}}users ADD COLUMN user_dst varchar(11) NOT NULL DEFAULT '0;0;0;0;60';
ALTER TABLE {{TABLE_PREFIX}}users ADD COLUMN user_rank_userset smallint NOT NULL DEFAULT 0;