don't use deprecated headers

svn path=/trunk/boost/accumulators/; revision=77587
accumulators: fix comment. refs #7456

svn path=/trunk/boost/accumulators/; revision=80826
fix long-standing dependency tracking bug, refs #7409

svn path=/trunk/boost/accumulators/; revision=80885
comment typo, refs #7510

svn path=/trunk/boost/accumulators/; revision=81147
fix comment typos, refs #7917

svn path=/trunk/boost/accumulators/; revision=83305
silence unused variable warnings, refs #6926

svn path=/trunk/boost/accumulators/; revision=83308
another attempt at silencing unused variable warnings, refs #6926

svn path=/trunk/boost/accumulators/; revision=83392