modifying optimize.portfolio.rebalancing and associated functions/methods for improved output

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/returnanalytics@3306 edb9625f-4e0d-4859-8d74-9fd3b1da38cb
Adding demo for optimize.portfolio.rebalancing

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/returnanalytics@3307 edb9625f-4e0d-4859-8d74-9fd3b1da38cb