fixed disk_io_job flags being used as file flags

git-svn-id: https://svn.code.sf.net/p/libtorrent/code/trunk@10159 a83610d8-ad2a-0410-a6ab-fc0612d85776
merge bitfield fix from RC_1_0 (although, fix doesn't apply)

git-svn-id: https://svn.code.sf.net/p/libtorrent/code/trunk@10161 a83610d8-ad2a-0410-a6ab-fc0612d85776
track RTT of piece requests

git-svn-id: https://svn.code.sf.net/p/libtorrent/code/trunk@10162 a83610d8-ad2a-0410-a6ab-fc0612d85776
log latency of bittorrent requests

git-svn-id: https://svn.code.sf.net/p/libtorrent/code/trunk@10164 a83610d8-ad2a-0410-a6ab-fc0612d85776