fixed reference count issue when turning off hashing. Added asserts and more efficient disk stats cllection
fixed reference count issue when turning off hashing. Added asserts and more efficient disk stats cllection

git-svn-id: 51f496e7cf1b55ee487494d18ee2d308bae7fe77@5592 f43f7eb3-cfe1-5f9d-1b5f-e45aa6702bda

steeve/libtorrent,steeve/libtorrent,steeve/libtorrent,steeve/libtorrent,steeve/libtorrent,steeve/libtorrent