rwi.stats() / rwi.stats.running(): fixed 'n' (used in EPS) when
period = "common".  Thanks to Donald Zhao for reporting.


git-svn-id: svn://svn.r-forge.r-project.org/svnroot/dplr@731 edb9625f-4e0d-4859-8d74-9fd3b1da38cb