recreate breakpoints in R-mode-hook directly, not on inferior startup.

git-svn-id: https://svn.r-project.org/ESS/trunk@5468 0bbaf3bd-34e0-0310-bf65-c717079852d4
generalize ess-show-traceback and move it on C-c`

git-svn-id: https://svn.r-project.org/ESS/trunk@5469 0bbaf3bd-34e0-0310-bf65-c717079852d4
add debug prefix choice to the tracebug submenu

git-svn-id: https://svn.r-project.org/ESS/trunk@5470 0bbaf3bd-34e0-0310-bf65-c717079852d4
add "save to custom" submenu + proper use of customize-set-variable

git-svn-id: https://svn.r-project.org/ESS/trunk@5471 0bbaf3bd-34e0-0310-bf65-c717079852d4
in visual debugging position the cursor at indentation instead of eol in order to avoid horizontal recentering on long lines)

git-svn-id: https://svn.r-project.org/ESS/trunk@5472 0bbaf3bd-34e0-0310-bf65-c717079852d4
preserve important ESS vars in vignette buffers

git-svn-id: https://svn.r-project.org/ESS/trunk@5473 0bbaf3bd-34e0-0310-bf65-c717079852d4
knitr supports encoding argument; reverting ad0433ee0dd8f02883abd7

git-svn-id: https://svn.r-project.org/ESS/trunk@5474 0bbaf3bd-34e0-0310-bf65-c717079852d4
Don't popup process buffer on "error:" (like in summary.lm), only on "Error:"

git-svn-id: https://svn.r-project.org/ESS/trunk@5475 0bbaf3bd-34e0-0310-bf65-c717079852d4
unfinished refactoring

git-svn-id: https://svn.r-project.org/ESS/trunk@5476 0bbaf3bd-34e0-0310-bf65-c717079852d4