[PATCH] New feature: closed tabs trash bin as in Opera

[Eduardo Robles Elvira]

Hello people, Edulix is back!

I've been working on this thing. There were two points remaining to fix of 
those that David Faure pointed out, and now those have been fixed:

 * one was to use KConfigGroup instead of KConfig. That was easy.
 * the other was to fix the misuse of the m_lock in the undo manager. Now as 
David suggested me today in IRC, I've changed the m_lock and instead of being 
a bool it's an enum with two states: {Enabled, OnlyUndoClosedTabs} so that 
the code is clearer to understand.

The patch works fine here and I belive that konqueror users will like it. I 
haven't got much more to add, but I will answer your questions as needed.

Thanks for your time,
         Eduardo Robles Elvira.
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