Features

1. Online visitors tracking across domain subdomains. You can set your domain in "Chat configuration" => "Misc" => "Set your domain to enable user tracking across different domain subdomains."
2. Mail templates now supports {country} and {city} variables.

Bugfix
1. /user/login was missing $currentUser instance after php session drop.

execute doc/update_db/update_59.sql for update and follow standard upgrade tutorial.