Fixed StackList refreshing
Fixed passing mevents to container
Fixed segfault in Grid (maxw was double freed)

There are still some minor errors:
	* in graphics morph tools there are sometimes crashes e.g. after geodesic dilate and then copy src image to dest
	* when window is resized in graphics/audio app and then go back to main screen background widget still has old size
	  (it should be reloaded, not simply rescaled over and over again)

Widget_setPosition() and all related methods should be virtual,
when I call Widget_setPosition() on stacklist, after it has been refreshed, only stacklist background is moved.

And there is a problem in mevent passed to widgets covered by another widgets.

For above two issues there is better solution placed in folder simple/

simple:
Added previous attempt to another implementation of widgets
All positions relative, no more need to call to _refresh from
client code.
There is still much work including plenty of refactoring and re-implementing
many of widgets and containers but result is worth it.