[kde-edu]: Clean code - fix warnings

[Anne-Marie Mahfouf]

Hi all,

As we move steadily towards KDE4, it'll be good to clean the kdeedu code the 
best we can.

In order to help the team of developers who fix things after libs changes and 
who go through the code, I'd like to ask you to have a look at the dashboard 
and try to fix things mentioned there.
http://ktown.kde.org/~dirk/dashboard/4.0/i386/kdeedu.html

You might think it's not important but it really is important to have the 
cleaner code we can. 

Thanks in advance for your work in that direction!

Anne-Marie