Fix typo in parameter doc, refs #4983

svn path=/trunk/libs/parameter/; revision=68291
Parameter: Merge [62231] from release - missing includes.

svn path=/trunk/boost/parameter/; revision=70523
Allow placeholder expressions in the type requirements for BOOST_PARAMETER_FUNCTION et al:

  (root_vertex
     , (vertex_descriptor<graphs::graph::_>)
     , *vertices(graph).first)

svn path=/trunk/boost/parameter/; revision=75415
Fix Boost.Parameter documentation bugs. Properly test type requirements example.

svn path=/trunk/libs/parameter/; revision=75417
[parameter] increase BOOST_PARAMETER_MAX_ARITY to 8

applying patch from ticket #6177



svn path=/trunk/boost/parameter/; revision=75811
parameter: access enable_if via namespace boost


svn path=/trunk/boost/parameter/; revision=75902