added more asserts related to the invariance between the peer connections' request queue and the piece picker
added more asserts related to the invariance between the peer connections' request queue and the piece picker


git-svn-id: 6ed3528c1be4534134272ad6dd050eeaa1f628d3@850 f43f7eb3-cfe1-5f9d-1b5f-e45aa6702bda

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