Add Touch option to xsetwacom manpage

We did not explicitly add this option when worked on the manpage
since we thought Gnome control center (g-c-c) or something else
in userland would take care of touch (as well as its gestures).
However, I see no sign of getting touch in g-c-c soon. Let's take
care of touch uers here for now.

Wacom manpage is also updated accordingly.

Reported-by: Nikolai Neff <gefrierbrand@users.sf.net>
Reviewed-by: Peter Hutterer <peter.hutterer@who-t.net>
Signed-off-by: Ping Cheng <pinglinux@gmail.com>
Don't reset properties on checkonly

We shouldn't make *any* change to the state if checkonly==true, but
we've been resetting properties anyway. This blocks off the calls
to the reset functions to prevent them from being called if it's
just a drill.

Signed-off-by: Jason Gerecke <killertofu@gmail.com>
Reviewed-by: Peter Hutterer <peter.hutterer@who-t.net>