ensure  utils package presence


git-svn-id: https://svn.r-project.org/ESS/trunk@5814 0bbaf3bd-34e0-0310-bf65-c717079852d4
corrected for revert


git-svn-id: https://svn.r-project.org/ESS/trunk@5815 0bbaf3bd-34e0-0310-bf65-c717079852d4
ess-..-clean-buffer assigned key and menu entry

git-svn-id: https://svn.r-project.org/ESS/trunk@5816 0bbaf3bd-34e0-0310-bf65-c717079852d4