Remove CentOS 6 tmux config

For some time now EPEL has shipped a tmux which works with the main
config.

.tmux.conf_centos6

@@ -1,140 +0,0 @@
-unbind C-b
-set-option -g prefix ^A
-bind a send-prefix
-
-# Bind appropriate commands similar to screen.
-# lockscreen ^X x
-unbind ^X
-bind ^X lock-server
-unbind x
-bind x lock-server
-
-# screen ^C c
-unbind ^C
-bind ^C new-window
-unbind c
-bind c new-window
-
-# detach ^D d
-unbind ^D
-bind ^D detach
-
-# displays *
-unbind *
-bind * list-clients
-
-# next ^@ ^N sp n
-unbind ^@
-bind ^@ next-window
-unbind ^N
-bind ^N next-window
-unbind " "
-bind " " next-window
-unbind n
-bind n next-window
-
-# title A
-unbind A
-bind A command-prompt "rename-window %%"
-
-# other ^A
-unbind ^A
-bind ^A last-window
-
-# prev ^H ^P p ^?
-unbind ^H
-bind ^H previous-window
-unbind ^P
-bind ^P previous-window
-unbind p
-bind p previous-window
-unbind BSpace
-bind BSpace previous-window
-
-# windows ^W w
-unbind ^W
-bind ^W list-windows
-unbind w
-bind w list-windows
-
-# kill K k
-unbind K
-bind K confirm-before "kill-window"
-unbind k
-bind k confirm-before "kill-window"
-
-# redisplay ^L l
-unbind ^L
-bind ^L refresh-client
-unbind l
-bind l refresh-client
-
-# " windowlist -b
-unbind '"'
-bind '"' choose-window
-
-# use Escape for entering copy mode, like screen
-bind Escape copy-mode
-
-# less time between commands in a command sequence
-set -s escape-time 0
-
-# use vi-style key bindings
-set-option -g mode-keys vi
-
-# start numbering windows a 1
-set -g base-index 1
-
-# Rather than constraining window size to the maximum size of any client
-# connected to the *session*, constrain window size to the maximum size
-# of any client connected to *that window*. Much more reasonable.
-set-window-option -g aggressive-resize on
-
-# the visual bell causes a micro delay when typing. Tab completion triggers
-# the bell and typing halts for a second and it's really annoying.
-set-option -g visual-bell off
-
-# status bar
-set-option -g status-justify left
-set-option -g status-left ''
-set-option -g status-right '#[fg=colour47]#H #[fg=red]#(cut -d " " -f 1-3 /proc/loadavg) #[fg=colour227]%Y-%m-%d %H:%M#[default]'
-
-# scrollback buffer
-set-option -g history-limit 4096
-
-# hijack the TERM variable for shells inside tmux
-# According to the tmux FAQ this MUST be "screen" or a derivative
-# http://tmux.svn.sourceforge.net/viewvc/tmux/trunk/FAQ
-set-option -g default-terminal "screen-256color"
-
-#### COLOUR (Solarized dark)
-
-# default statusbar colors
-set-option -g status-bg black #base02
-set-option -g status-fg yellow #yellow
-set-option -g status-attr default
-
-# default window title colors
-set-window-option -g window-status-fg blue #base0
-set-window-option -g window-status-bg default
-#set-window-option -g window-status-attr dim
-
-# active window title colors
-set-window-option -g window-status-current-fg red #orange
-set-window-option -g window-status-current-bg default
-#set-window-option -g window-status-current-attr bright
-
-# pane border
-set-option -g pane-border-fg black #base02
-set-option -g pane-active-border-fg green #base01
-
-# message text
-set-option -g message-bg black #base02
-set-option -g message-fg red #orange
-
-# pane number display
-set-option -g display-panes-active-colour blue #blue
-set-option -g display-panes-colour red #orange
-
-# clock
-set-window-option -g clock-mode-colour green #green