move some defines from headers to cpp files (to improve ABI stability). add some documentation. regenerate html. minor fixes to documentation script

git-svn-id: https://svn.code.sf.net/p/libtorrent/code/trunk@9429 a83610d8-ad2a-0410-a6ab-fc0612d85776
documentation fixes

git-svn-id: https://svn.code.sf.net/p/libtorrent/code/trunk@9430 a83610d8-ad2a-0410-a6ab-fc0612d85776
clean up entry::print

git-svn-id: https://svn.code.sf.net/p/libtorrent/code/trunk@9431 a83610d8-ad2a-0410-a6ab-fc0612d85776