[kde-edu]: Fixes in code

[Anne-Marie Mahfouf]

Hi,

Benjamin Meyer (aka icefox) made some scripts and ran them in kde code. These 
scripts detect various common errors made by programmers 
and I began to fix these errors in kdeedu following this report:
http://www.icefox.net/kde/tests/report.html
(this page will be updated)
The tests themselves can be found here:
http://webcvs.kde.org/cgi-bin/cvsweb.cgi/kdenonbeta/kdetestscripts/
As this is a huge and repetitive task, please check your application to see if 
I did not made any mistake (even if the commits are closely monitored by kde 
devels).
You can also fix any errors yourself of course!
Thanks,

Anne-Marie