New match search option

A user has requested an option for the ‘look for trades’ section that nobody had requested as yet, but that makes a lot of sense, so I have implemented it right away: it is the option to show only matches with users who have logged in to the site recently, in the last X days (from 5 to 90). This way you remove matches with not-so-active users who may not respond to your trade offers very promptly, and you can concentrate on the most active users.