merged create_torrent fix from RC_0_16

git-svn-id: https://svn.code.sf.net/p/libtorrent/code/trunk@9286 a83610d8-ad2a-0410-a6ab-fc0612d85776
fix resume data bug introduced when deprecating the iterators from file_storage

git-svn-id: https://svn.code.sf.net/p/libtorrent/code/trunk@9287 a83610d8-ad2a-0410-a6ab-fc0612d85776
merged test from RC_0_16

git-svn-id: https://svn.code.sf.net/p/libtorrent/code/trunk@9292 a83610d8-ad2a-0410-a6ab-fc0612d85776