got rid of compile time xidx, grabbing the mouse pointer instead, falling back to screen 0 if no pointer available

config.h

@@ -6,9 +6,4 @@ static const char *normbgcolor = "#cccccc";
 static const char *normfgcolor = "#000000";
 static const char *selbgcolor  = "#0066ff";
 static const char *selfgcolor  = "#ffffff";
-
 static unsigned int spaceitem  = 30; /* px between menu items */
-
-#ifdef XINERAMA
-static unsigned int xidx       = 0;  /* Xinerama screen index to use */
-#endif