cleanup and more documentation. 

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/aqr@58 edb9625f-4e0d-4859-8d74-9fd3b1da38cb
Cleanup of final warnings (hopefully)

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/aqr@59 edb9625f-4e0d-4859-8d74-9fd3b1da38cb