emacs: fix/clean up keybindings
emacs: fix/clean up keybindings

The ",n" keybinding was broken (balance-windows does not work after the
evil-window-new command, for some reason).

Also, add in keybindings for tab navigation while in insert mode, just
like in .vimrc.

listx/syscfg,listx/syscfg,listx/syscfg,listx/syscfg,listx/syscfg