Class viewer patches

[Alexander Dymo]

Could you please review this patches for class viewer part.
This is not a real bugfix with bug number assosiated so according to coolo
I need to post it here for review.

This patch fixes performance problems with class view (did you tried to work
on kdevelop or another big project with background parser delay set to 
500 ms?). Previously, comboboxes on a panel were reloaded completely
on all three signals (addedSourceInfo, removedFromSourceInfo and 
updatedSourceInfo). This fix introduce separate signal handlers for add
and remove which don't reload all comboboxes completely.

-- 
Alexander Dymo
Ukrainian State Maritime Technical University, IT Department
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