added option to deliberately corrupt data from certain peers, to test the case when hash fails occurs
added option to deliberately corrupt data from certain peers, to test the case when hash fails occurs

git-svn-id: 4f0141143c3c635d33f1b9f02fcb2b6c73e45c89@2446 a83610d8-ad2a-0410-a6ab-fc0612d85776

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