Autotiling 1.9

New arguments added by @JoseConseco in #44:

  -sw SPLITWIDTH, --splitwidth SPLITWIDTH
                        set the width of the vertical split (as factor);
                        default: 1.0;
  -sh SPLITHEIGHT, --splitheight SPLITHEIGHT
                        set the height of the horizontal split (as factor);
                        default: 1.0;
  -sr SPLITRATIO, --splitratio SPLITRATIO
                        Split direction ratio - based on window height/width;
                        default: 1;try "1.61", for golden ratio - window has
                        to be 61% wider for left/right split; default: 1.0;