Modifying chart.EfficientFrontierOverlay to use portfolio.list

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/returnanalytics@3319 edb9625f-4e0d-4859-8d74-9fd3b1da38cb
adding end of line to demo/00Index and minor edit to ROI vignette

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/returnanalytics@3320 edb9625f-4e0d-4859-8d74-9fd3b1da38cb
Modifying how maximum sharpe and maximum starr ratio are calculated for ROI. Previously using a binary search I wrote, now using optimize() so it is more robust and easier to maintain.

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/returnanalytics@3321 edb9625f-4e0d-4859-8d74-9fd3b1da38cb