Extensive GUI changes

[Bernhard Herzog]

Hi all, 

I've just committed the extensive changes I've been working on. The
changes are very extensive and touch practically all parts of the UI
code. The reorganization has two goals:
	
    1. Change the user interface to make the keyring editor the main
       window.

    2. Internal changes to make the code more object oriented and more
       maintainable.

The reorganization is not complete yet, and currently not everything
works again.

  Bernhard

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