Log Message:
update to BitTorrent 4.0.2

Changes in this release:
- Opening a torrent that is already open in the GUI now has the correct behavior \ 
rather than
  raising an error
- Backported --chop_max_allow_in from 4.1 to help fix TCP stack flaking out \ 
problem on Windows
- Robustly handle config files corrupted by Windows
- Better error messages when a torrent already meets seeding limits
- File filters