tmux.conf rebind some keys to better version
tmux.conf rebind some keys to better version

- n, p: They go to the next and previous window, rebinded to enable
  repetition without repeated press the prefix key.
- s: Show a tree of all sessions and windows to choose. Adding the
  option -u that enable start the tree all expanded, instead of
  collapsed that is the default.

rff/cfgbin,rff/cfgbin,rff/cfgbin,rff/cfgbin