bugfix for denominator in the VaR calculation of risk.measure()
and improvements in the demo

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/qrm@84 edb9625f-4e0d-4859-8d74-9fd3b1da38cb
minor update

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/qrm@85 edb9625f-4e0d-4859-8d74-9fd3b1da38cb
minor update

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/qrm@86 edb9625f-4e0d-4859-8d74-9fd3b1da38cb