Start using webkitwindow to provide the browser window.

Basic terminal emulation works, iframe mode does not.
Fix reloading the terminal.
Iframe mode works with the qt backend too.

`sview <image.png>` works, including resizing but commands
(ctrl-<key> sequences) do not work as expected.
Remove remaining usages and mentions of schirm.webserver

No need for the ws4py module any more: websockets are
implemented via a websocket-like interface in the embedded
webkit making calls into PyQT and vice versa.
Add licence and copyright notes for the pychan library.
Update README.
Embed the webkitwindow library.

I do not want to deal with dependencies for now, so just include it here.
webkitwindow commit hash: 08ceb02
Do not segfault when exiting the terminal.

Update webkitwindow to 6b1cacf.
Merge branch 'qtwebkit'