i rewrote handling of focus events. this is pretty much based on blackbox's current...

i rewrote handling of focus events. this is pretty much based on blackbox's current form, as well as reading the xlib programming manual at:
http://tronche.com/gui/x/xlib/events/input-focus/normal-and-grabbed.html

this may break for people. that'd be nice to hear about, so it can be fixed. but hopefully this is more robust. it sure is a lot more simple.