there doesn't seem to be any point in exporting piece_block_progress, so don't do that. Introduce magic number check in disk_io_thread (mysterious crash/corruption happens in storage unit test on mac, but not very often and hard to reproduce). 

git-svn-id: https://svn.code.sf.net/p/libtorrent/code/trunk@9676 a83610d8-ad2a-0410-a6ab-fc0612d85776
added documentation

git-svn-id: https://svn.code.sf.net/p/libtorrent/code/trunk@9677 a83610d8-ad2a-0410-a6ab-fc0612d85776
reflowed documentation comments in session_settings.hpp, added missing documentaton. regeneraged html

git-svn-id: https://svn.code.sf.net/p/libtorrent/code/trunk@9678 a83610d8-ad2a-0410-a6ab-fc0612d85776
reflow some comments

git-svn-id: https://svn.code.sf.net/p/libtorrent/code/trunk@9679 a83610d8-ad2a-0410-a6ab-fc0612d85776
support msvc /RTC option and make run_regression_tests support passing on arbitrary boost-build options (to allow different testers enable rtc and sanitizers)

git-svn-id: https://svn.code.sf.net/p/libtorrent/code/trunk@9681 a83610d8-ad2a-0410-a6ab-fc0612d85776
fix sanitize=rtc option in Jamfile

git-svn-id: https://svn.code.sf.net/p/libtorrent/code/trunk@9682 a83610d8-ad2a-0410-a6ab-fc0612d85776