merged fix from RC_0_16

git-svn-id: https://svn.code.sf.net/p/libtorrent/code/trunk@8683 a83610d8-ad2a-0410-a6ab-fc0612d85776
fix reference documentation generation

git-svn-id: https://svn.code.sf.net/p/libtorrent/code/trunk@8684 a83610d8-ad2a-0410-a6ab-fc0612d85776
more documentation polishing

git-svn-id: https://svn.code.sf.net/p/libtorrent/code/trunk@8685 a83610d8-ad2a-0410-a6ab-fc0612d85776
fix test_checking for windows

git-svn-id: https://svn.code.sf.net/p/libtorrent/code/trunk@8686 a83610d8-ad2a-0410-a6ab-fc0612d85776
fixed typos

git-svn-id: https://svn.code.sf.net/p/libtorrent/code/trunk@8687 a83610d8-ad2a-0410-a6ab-fc0612d85776
export time_now_string for unit tests

git-svn-id: https://svn.code.sf.net/p/libtorrent/code/trunk@8689 a83610d8-ad2a-0410-a6ab-fc0612d85776
moved documentation form manual.rst to headers

git-svn-id: https://svn.code.sf.net/p/libtorrent/code/trunk@8690 a83610d8-ad2a-0410-a6ab-fc0612d85776
reintroduced declaration that was removed by mistake

git-svn-id: https://svn.code.sf.net/p/libtorrent/code/trunk@8691 a83610d8-ad2a-0410-a6ab-fc0612d85776
move documentation from manual to headers

git-svn-id: https://svn.code.sf.net/p/libtorrent/code/trunk@8692 a83610d8-ad2a-0410-a6ab-fc0612d85776
merge fix from RC_0_16

git-svn-id: https://svn.code.sf.net/p/libtorrent/code/trunk@8695 a83610d8-ad2a-0410-a6ab-fc0612d85776
merged time critical pieces improvement from RC_0_16

git-svn-id: https://svn.code.sf.net/p/libtorrent/code/trunk@8697 a83610d8-ad2a-0410-a6ab-fc0612d85776