Cleared out a load of uneeded stuff.

Cleared out a load of uneeded stuff.
No longer using a "canvas" element or a layout. Now, this is a clean widget.
Removed the button. No real reason to keep it as a part of the widget.
The paintEvent now correctly draws directly on the widget.
Changed Ilp2QImage, no longer makes a clone of the IplImage.
Changes to painting, the conversion mechanism, and clearing out
unneded stuff removed a bad memory-leak, leaking somewhere around
5.10MBytes/second previously, now leaks one frame when "dying unclean"..

git-svn-id: https://dilbert.hig.no/svn/student/020535/qopencamwidget/trunk@171 07accd87-1e0b-0410-939d-c05d8a058e03