add an option to surpress continuous process output

git-svn-id: https://svn.r-project.org/ESS/trunk@5493 0bbaf3bd-34e0-0310-bf65-c717079852d4
add multiple-next, multiple-continue and step-up debug commands

git-svn-id: https://svn.r-project.org/ESS/trunk@5494 0bbaf3bd-34e0-0310-bf65-c717079852d4
active/inactive breakpoints need not be sourced

git-svn-id: https://svn.r-project.org/ESS/trunk@5495 0bbaf3bd-34e0-0310-bf65-c717079852d4
cosmetic ess-inf

git-svn-id: https://svn.r-project.org/ESS/trunk@5496 0bbaf3bd-34e0-0310-bf65-c717079852d4
back to no-prefix for debugging (C-c is overwriten + much more dificult to type)

git-svn-id: https://svn.r-project.org/ESS/trunk@5497 0bbaf3bd-34e0-0310-bf65-c717079852d4