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: a9fe57c6430a6997a38eed96ede4af2f77d6b776@850 a83610d8-ad2a-0410-a6ab-fc0612d85776

chongyc/libtorrent,chongyc/libtorrent,chongyc/libtorrent,chongyc/libtorrent