fix bug in duplicate-peer resolution. just take the port into account, not the whole IP, because the different ends may have different ideas of what their IP is

git-svn-id: https://svn.code.sf.net/p/libtorrent/code/trunk@8811 a83610d8-ad2a-0410-a6ab-fc0612d85776
support extensions removing torrents in tick()

git-svn-id: https://svn.code.sf.net/p/libtorrent/code/trunk@8812 a83610d8-ad2a-0410-a6ab-fc0612d85776