fix a bug (workaround) that `C-c C-c` was not bound correctly for magit commit
update support for ipython

- revert ipython prompt format to classic prompt
- C-a is bound to `comint-bol-or-process-mark`.
add cmake-mode and helper for org mode mark-up

- add cmake-mode, configure `auto-mode-alist` properly
- mark-up helper bindings using certain unicode characters
add `browse-kill-ring` and update config for orgmode 7.9.4