DOC: Add to the 2.3 changelog
ENH: fail if there is no man2html installed
DOC: thought to be committed -- fselector docstring for SplitRFE
DOC: added page courses for materials used in courses (pointers to tutorials and lecture slides)
ENH: pruning obsolete _NPERLABEL_STR (thanks McKell Carter)
DOC: Note journal impact for papers that use PyMVPA as a method

Also note the cummulative impact for 2009-2012 (fresher stats aren't
available yet).