Improve changing the order of trackers

[XChesser]

Current implementation of trackers ordering is a little strange and inconvenient. For example, the torrent has 3 trackers: 0:tracker1.com 1:tracker2.com 2:tracker3.com If I select tracker1.com and press "Down", nothing happens. If I press "Up" for it, its number is increased by one and the list looks so: 1:tracker1.com 1:tracker2.com 2:tracker3.com So, the first thing is that Up/Down buttons increase/decrease the rank of the tracker while they should change the rank on the contrary, I think. The second thing is that tracker2.com doesn't change its number to 0 in the example above. So if I want to pull down [0] tracker to the end I have to change the ranks manually for each tracker in list: tracker1.com=>[2], tracker2.com=>[0], tracker3.com=>[1].