improved seeding of files with small pieces to avoid swithing back and forth between unchoke sets
improved seeding of files with small pieces to avoid swithing back and forth between unchoke sets

git-svn-id: 4f0141143c3c635d33f1b9f02fcb2b6c73e45c89@2817 a83610d8-ad2a-0410-a6ab-fc0612d85776

dpolishuk/libtorrent,halorgium/libtorrent,dpolishuk/libtorrent,archos-sa/libtorrent-avp,archos-sa/libtorrent-avp,archos-sa/libtorrent-avp,halorgium/libtorrent,dpolishuk/libtorrent,dpolishuk/libtorrent,halorgium/libtorrent,svn2github/libtorrent-rasterbar-trunk,dpolishuk/libtorrent,svn2github/libtorrent-rasterbar-trunk,svn2github/libtorrent-rasterbar-trunk,archos-sa/libtorrent-avp,svn2github/libtorrent-rasterbar-trunk,archos-sa/libtorrent-avp,halorgium/libtorrent,halorgium/libtorrent,halorgium/libtorrent,archos-sa/libtorrent-avp,dpolishuk/libtorrent