improve TCP/uTP mixed mode algorithm by only taking peers into account that have outstanding requests (and want to send or expect to receive). Also throttle upload and download independently
improve TCP/uTP mixed mode algorithm by only taking peers into account that have outstanding requests (and want to send or expect to receive). Also throttle upload and download independently

git-svn-id: 6ed3528c1be4534134272ad6dd050eeaa1f628d3@6102 f43f7eb3-cfe1-5f9d-1b5f-e45aa6702bda

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