Made it possible to disable the touchpad at runtime. (Patch

from "J�rg B�sner" <ich@joerg-boesner.de>.)

synclient.c

@@ -61,6 +61,7 @@ static struct Parameter params[] = {
     DEFINE_PAR("AccelFactor",          accl,                    PT_DOUBLE, 0, 0.2),
     DEFINE_PAR("EdgeMotionSpeed",      edge_motion_speed,       PT_INT,    0, 400),
     DEFINE_PAR("UpDownScrolling",      updown_button_scrolling, PT_BOOL,   0, 1),
+    DEFINE_PAR("TouchpadOff",          touchpad_off,            PT_BOOL,   0, 1),
     { 0, 0, 0, 0, 0 }
 };