Hard to track problem with tmux's config

To make "tmux attach" create a session when there aren't any active yet,
you need to call "new-session" in the config. My problem was that
new-session was set before setting the terminal to 256 colors. Hence,
when a session is created, it has TERM=screen by default.

tmux.conf

@@ -54,9 +54,6 @@ setw -g mode-mouse on
 set-option -g mouse-select-pane on
 set-option -g mouse-resize-pane on
 
-# Start new-session as default
-new-session
-
 # resize only if actively looking
 setw -g aggressive-resize on
 
@@ -98,3 +95,7 @@ bind m run "tmux-zoom.sh"
 
 # Fix for emacs and the like
 set -s escape-time 0
+
+# Start new-session as default
+new-session
+