major changes

[Ulf Ekström]

Hi all. Right now I am doing some major changes to the sourcecode, so
I would be happy if no one checks in anything in the next few days. I
am basically removing all the  reference counting and replacing it
with a much simpler system of weak references, because we always know
who is the "owner" of objects anyway.I think that this will make the
code much easier to maintain and understand.

Regards,
Ulf