Detail: Merge some whitespace fixes from release.

svn path=/trunk/libs/multi_index/; revision=80349
fixed #8034

svn path=/trunk/boost/multi_index/; revision=82897
stopped using Boost.Test in favor of <boost/detail/lightweight_test.hpp> framework

svn path=/trunk/libs/multi_index/; revision=82970
strengthened unused var warning avoidance

svn path=/trunk/libs/multi_index/; revision=82993
fixed #8129

svn path=/trunk/libs/multi_index/; revision=83058