rwi.stats.running.R:
* 'n.trees' and 'n.cores' should now be OK
* 'c.eff' is now 0 if no correlations were computed
* When using period = "common", 'n' is now 0 instead of the full
  number in case there are no complete cases in the running window.
* Technical optimizations


git-svn-id: svn://svn.r-forge.r-project.org/svnroot/dplr@744 edb9625f-4e0d-4859-8d74-9fd3b1da38cb