improve existing and add more R error patterns

git-svn-id: https://svn.r-project.org/ESS/trunk@5650 0bbaf3bd-34e0-0310-bf65-c717079852d4
new indentation bug

git-svn-id: https://svn.r-project.org/ESS/trunk@5651 0bbaf3bd-34e0-0310-bf65-c717079852d4