Add key binding for incremental search
Add key binding for incremental search

Originally it was bound to Ctrl-R and Ctrl-S; unfortunately, Ctrl-S was
bound to “XOFF” flow-control command for most terminal emulators, and I
don't want to mess with that.

Reference:
https://unix.stackexchange.com/questions/137842/what-is-the-point-of-ctrl-s

franklinyu/debian-setup