more sas bugs

git-svn-id: https://svn.r-project.org/ESS/trunk@5426 0bbaf3bd-34e0-0310-bf65-c717079852d4
cosmetic

git-svn-id: https://svn.r-project.org/ESS/trunk@5427 0bbaf3bd-34e0-0310-bf65-c717079852d4
temporary adjustments in ess-smart-underscore to acomodate polymode

git-svn-id: https://svn.r-project.org/ESS/trunk@5428 0bbaf3bd-34e0-0310-bf65-c717079852d4