merged fix from RC_0_16
merged changes from trunk
fix bug in torrent::is_finished()
remind peers that they are choked if they keep sending requests while choked. disconnect them eventually
merged configure fix from RC_0_16
merged error message fix from RC_0_16
fix unchoke accounting
stub for file_storage test
support renaming files to absolute paths
fix file_pool to support new absolute paths in file_storage
merged changes from trunk
merge from trunk