mark up a few more places to make the resume-data dirty

git-svn-id: http://libtorrent.googlecode.com/svn/trunk@10109 f43f7eb3-cfe1-5f9d-1b5f-e45aa6702bda
some more disk io thread asserts

git-svn-id: http://libtorrent.googlecode.com/svn/trunk@10110 f43f7eb3-cfe1-5f9d-1b5f-e45aa6702bda
remove some peer connection dependencies on m_ses

git-svn-id: http://libtorrent.googlecode.com/svn/trunk@10112 f43f7eb3-cfe1-5f9d-1b5f-e45aa6702bda
fix another boost.chrono issue

git-svn-id: http://libtorrent.googlecode.com/svn/trunk@10113 f43f7eb3-cfe1-5f9d-1b5f-e45aa6702bda
fix todo comment

git-svn-id: http://libtorrent.googlecode.com/svn/trunk@10114 f43f7eb3-cfe1-5f9d-1b5f-e45aa6702bda
separate stats counters from session_interface (this was the main use of m_ses in peer connections)

git-svn-id: http://libtorrent.googlecode.com/svn/trunk@10115 f43f7eb3-cfe1-5f9d-1b5f-e45aa6702bda
removed unused session_impl member, m_next_disk_peer

git-svn-id: http://libtorrent.googlecode.com/svn/trunk@10116 f43f7eb3-cfe1-5f9d-1b5f-e45aa6702bda