Adding dod functions, tests and man entries to sensRdod branch

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/sensr@52 edb9625f-4e0d-4859-8d74-9fd3b1da38cb
updating DESCRITION and NAMESPACE files with DOD implementation and fixing potential bug(let) in R/power.R

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/sensr@53 edb9625f-4e0d-4859-8d74-9fd3b1da38cb
Adding NEWS entry

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/sensr@54 edb9625f-4e0d-4859-8d74-9fd3b1da38cb