- Unordered tests can run lightweight test or Boost.Test (at least
theoretically).
- Workaround Open BSD's incorrect numeric_limits.
- Move the hash extensions in their own file.
- Various small improvements to the unordered docs.
- Fix some unordered examples.
Merged revisions 43117-43837 via svnmerge from
https://svn.boost.org/svn/boost/branches/unordered/trunk
[SVN r43838]