merge bitfield issue fix from RC_0_16

git-svn-id: http://libtorrent.googlecode.com/svn/trunk@9995 f43f7eb3-cfe1-5f9d-1b5f-e45aa6702bda
merged lsd fix from RC_0_16

git-svn-id: http://libtorrent.googlecode.com/svn/trunk@9997 f43f7eb3-cfe1-5f9d-1b5f-e45aa6702bda