add some alias em, emo, gg

em  : open the file current window.
emo : open the file other window.
gg  : shot command key for vc-git-grep
server mode enable on window only because private taste
change the short key because the byobu was upgraded on server

[f7][f8] can't use on new byobu, so I change the shortkey below.
[f7] -> [f11] : buffer search & listing
[f8] -> [f10] : shell pop short key