* Various english usage typos corrected (that had been pointed out from Mikko - thanks!): E.g., an rwl -> a rwl. Dataset to data set. And so on.
* Generic methods for rwl.stats and crn.plot reverted for backwards compatability.
* Some other light help and vignette edits.

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/dplr@808 edb9625f-4e0d-4859-8d74-9fd3b1da38cb