introduce a torrent ID on torrent_handle. useful for torrents without metadata
introduce a torrent ID on torrent_handle. useful for torrents without metadata

git-svn-id: 51f496e7cf1b55ee487494d18ee2d308bae7fe77@7360 f43f7eb3-cfe1-5f9d-1b5f-e45aa6702bda

steeve/libtorrent,steeve/libtorrent,steeve/libtorrent,steeve/libtorrent,steeve/libtorrent,steeve/libtorrent