Shared undo closed windows list over D-Bus between different konqueror processes

[Eduardo Robles Elvira]

Hi all!

Finally it's done, after two days working hard on this. I think this D-Bus 
patch is complete, I've tested it for a while and seems to be working well.

I attach the patch here so that you can make some comments before commiting. 
There are some code decissions I had to do that might be difficult to explain 
but I will explain them happily if asked.

I plan to add some test case after this and to fix a undo closed window 
related bug and after that, I will consider the "undo closed window" feature 
complete for now. More complete than in any other web/file browser anyway ;-) 

Greetings,
        Eduardo Robles Elvira.
-- 
"The reasonable man adapts himself to the world; the unreasonable one
persists in trying to adapt the world to himself. Therefore all progress
depends on the unreasonable man." (George Bernard Shaw)
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