Symbols renamed to be like mode-line indicator.

Symbols renamed to be like mode-line indicator.
Supposed to now also work for Lucid.
(2C-mode-map): New name for `tc-mode-map'.  Additionally bound to [f2].
(2C-minor-mode-map) New variable.
(2C-mode): New name for `tc-other'.
(2C-mode-line-format): New name for `tc-mode-line-format'.
(2C-other-buffer-hook): New variable.
(2C-separator): New name for `tc-separator'.
(2C-window-width): New name for `tc-window-width'.
(2C-beyond-fill-column): New name for `tc-beyond-fill-column'.
(2C-autoscroll, 2C-autoscroll-start): New variables.

(2C-other): New name for `tc-other'.
(2C-mode): New name for `tc-mode', `tc-two-columns'.
(2C-two-columns): New function.
(2C-associate-buffer): New name for `tc-associate-buffer'.
(2C-split): New name for `tc-split'.
(2C-dissociate): New name for `tc-dissociate'.
(2C-merge): New name for `tc-merge'.
(2C-associated-buffer): New name for `tc-associated-buffer'.
(2C-toggle-autoscroll, 2C-autoscroll): New functions.
(tc-scroll-line, tc-scroll-up, tc-scroll-down, tc-recenter): Deleted
functions.