put ess-debug-goto-input-event-marker back into dev map

git-svn-id: https://svn.r-project.org/ESS/trunk@5630 0bbaf3bd-34e0-0310-bf65-c717079852d4
todo

git-svn-id: https://svn.r-project.org/ESS/trunk@5631 0bbaf3bd-34e0-0310-bf65-c717079852d4