EWMA + start of GARCH(1,1) and forecasting desired functions

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/uwgarp@58 edb9625f-4e0d-4859-8d74-9fd3b1da38cb
Proj Outline amendment

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