comint & ess mode keybindings

It would be nice to have the same keybindings that we have in comint mode & ess mode,
e.g from comint-mode: C-c C-u = kill input line
C-c C-p = move cursor to previous prompt
C-c C-n = move cursor to next prompt
M-r = search input history backwards
from ess-mode: C-c C-j = evaluate current line
C-c C-b = evaluate buffer
C-c C-r = evaluate region