Group the options more logically and improve their descriptions.
Add the missing help strings for Xspice --help and standardize the
messages to start with a lowercase and not end with a period.
In the Xorg configuration, always show the default in the
Signed-off-by: Francois Gouget <firstname.lastname@example.org>
Acked-by: Christophe Fergeau <email@example.com>