(TMUX) Little fixes.

    + missing option keyword
    + base index for panes too
    + decrease keystrokes delays
(TMUX) Set on tmux visual notifications.
(TMUX) 256 color terminal.
Merge branch 'adopt' into trial
Merge branch 'trial-tmux-256colors' into trial

his merge is necessary,
Merge branch 'trial-tmux-visual-notifications' into trial