fix build with verbose logging

git-svn-id: svn://svn.code.sf.net/p/libtorrent/code@10357 a83610d8-ad2a-0410-a6ab-fc0612d85776
regenerate documentation

git-svn-id: svn://svn.code.sf.net/p/libtorrent/code@10358 a83610d8-ad2a-0410-a6ab-fc0612d85776
update comments

git-svn-id: svn://svn.code.sf.net/p/libtorrent/code@10359 a83610d8-ad2a-0410-a6ab-fc0612d85776
use the session-wide hostname resolver in torrent.cpp

git-svn-id: svn://svn.code.sf.net/p/libtorrent/code@10360 a83610d8-ad2a-0410-a6ab-fc0612d85776