[RFC] Fix/complete option list/description in manual and in gdb --help.

[Philippe Waroquiers]

On Sun, 2021-06-06 at 16:39 +0200, Philippe Waroquiers wrote:
> 
> Changes in main.c are:
> * the -w option was since 2003 commented as 'not sure actually useful'.
>   As -nw is disabling tui, and -w was activating an optional TK based
>   GUI, I changed the behaviour of -w to activate the TUI interface if
>   configured.  In case both TK and TUI are configured, -w starts
>   the TUI interface.
Correction: for backward compatibility reasons, in case both TK and TUI
GUIs are configured, TK based one is started (by adding its interpreter
last).

Philippe