Fixes #9073

git-svn-id: http://svn.boost.org/svn/boost/trunk@85589 b8fc166d-592f-0410-95f2-cb63ce0dd405
Respect indentation at the start of a file.

Fix bug where a code block at the start of a file was not recognised.
I was actually adding this test to check that the `source_mode_unset`
mechanism in `doc_info_grammar.cpp` was working, but it ended exposing
this bug.

git-svn-id: http://svn.boost.org/svn/boost/trunk@85590 b8fc166d-592f-0410-95f2-cb63ce0dd405
Thread: protect condition_variable/_any wait_for and wait_until from malicious input.

git-svn-id: http://svn.boost.org/svn/boost/trunk@85591 b8fc166d-592f-0410-95f2-cb63ce0dd405
Thread: protect condition_variable/_any wait_for and wait_until from malicious input.

git-svn-id: http://svn.boost.org/svn/boost/trunk@85592 b8fc166d-592f-0410-95f2-cb63ce0dd405
Changed from iterator to const_iterator to fix VC++ issue

git-svn-id: http://svn.boost.org/svn/boost/trunk@85593 b8fc166d-592f-0410-95f2-cb63ce0dd405
Fixed VC++ warning

git-svn-id: http://svn.boost.org/svn/boost/trunk@85594 b8fc166d-592f-0410-95f2-cb63ce0dd405
Fix bug in cpp_int serialization code

git-svn-id: http://svn.boost.org/svn/boost/trunk@85595 b8fc166d-592f-0410-95f2-cb63ce0dd405