99-synaptics-t440s.conf: lots of improvements

Many improvements to the touchpad behavior, I think this is very
close to done now.

Shrink the size of the top SoftButtonAreas a bit.

Apply some settings reporeted to work well on an X1 Carbon, see:
http://major.io/2013/08/24/get-a-rock-solid-linux-touchpad-configuration-for-the-lenovo-x1-carbon/

Also disable TapAndDragGesture.

Signed-off-by: Scott Garman <sgarman@zenlinux.com>