merged changes from RC_1_0

git-svn-id: http://svn.code.sf.net/p/libtorrent/code/trunk@10472 a83610d8-ad2a-0410-a6ab-fc0612d85776
fix file progress calculation bug (with unit test)

git-svn-id: http://svn.code.sf.net/p/libtorrent/code/trunk@10473 a83610d8-ad2a-0410-a6ab-fc0612d85776
merged changes from RC_1_0

git-svn-id: http://svn.code.sf.net/p/libtorrent/code/trunk@10476 a83610d8-ad2a-0410-a6ab-fc0612d85776